Sexual and asexual reproduction were discussed. Asexual reproduction requires only one parent and produces offspring identical to the parent. Methods of asexual reproduction include binary fission, budding, fragmentation, and parthenogenesis. Sexual reproduction requires two parents and combines their genetic material, producing offspring with genetic variation. Methods of sexual reproduction are pollination, external fertilization, and internal fertilization.
Methods/Modes of reproduction by L.ZnerualLanieZnerual
Sexual and asexual reproduction differ in that asexual reproduction involves only one parent and results in offspring that are exact genetic copies, while sexual reproduction requires two parents and the combining of genetic material leads to offspring that are genetically different than the parents. Asexual reproduction methods include binary fission, budding, fragmentation, and parthenogenesis in single-celled and multicellular organisms. Sexual reproduction involves the fertilization of an egg, either externally or internally, requiring both male and female contributions.
Methods of reproduction can be sexual, requiring two parents, or asexual with one parent. Asexual reproduction results in offspring that are exact clones of the parent with little variation. Common asexual reproduction methods include binary fission in single-celled organisms, budding where new growth emerges from the parent, and fragmentation where a parent breaks into pieces that form new individuals. Sexual reproduction requires an egg and sperm and results in offspring with unique genetic combinations from both parents, increasing variation within a species.
Asexual reproduction requires only one parent and produces offspring that are exact genetic copies. This process is faster than sexual reproduction but does not allow for variation and evolution. Common asexual reproduction methods include binary fission, budding, fragmentation, and spore production.
Sexual reproduction requires two parents and the fusion of egg and sperm to produce offspring with unique combinations of genetic material. This process creates genetic variation and drives evolution by allowing populations to adapt to changing environments. Common sexual reproduction methods include pollination, external fertilization in water, and internal fertilization in mammals and other land animals.
Reproduction is the biological process by which organisms produce offspring. There are two main types of reproduction: asexual reproduction, which requires only one parent and produces offspring identical to the parent; and sexual reproduction, which requires two parents and produces offspring with genetic variation. Asexual reproduction occurs through binary fission, budding, or fragmentation, while sexual reproduction can occur through external fertilization, internal fertilization, or pollination.
There are two main types of reproduction: asexual and sexual. Asexual reproduction requires only one parent and produces offspring that are genetically identical clones. It occurs through binary fission, budding, or fragmentation. Sexual reproduction requires two parents and produces offspring with genetic variations from the parents. It can occur through external fertilization in water or internal fertilization within the female's body. Sexual reproduction creates more genetic diversity to help species adapt and survive.
Asexual reproduction allows organisms to reproduce without sex, creating offspring that are genetically identical to the parent. There are several methods of asexual reproduction, including binary fission in single-celled organisms, budding seen in hydra and plants, fragmentation where a parent breaks into pieces that grow into new individuals, and parthenogenesis in some invertebrates and plants where females can produce offspring without fertilization. While asexual reproduction is efficient and produces offspring adapted to the parent's environment, it does not allow for genetic variation and evolution of the species to changing environments.
The document discusses and compares methods of asexual and sexual reproduction. Asexual reproduction requires only one parent and produces offspring that are exact genetic copies. Methods of asexual reproduction include binary fission, budding, fragmentation, and parthenogenesis. Sexual reproduction requires two parents and the combining of genetic material, resulting in offspring that are genetically different than the parents. Methods of sexual reproduction discussed are pollination, external fertilization, and internal fertilization.
Sexual and asexual reproduction were discussed. Asexual reproduction requires only one parent and produces offspring identical to the parent. Methods of asexual reproduction include binary fission, budding, fragmentation, and parthenogenesis. Sexual reproduction requires two parents and combines their genetic material, producing offspring with genetic variation. Methods of sexual reproduction are pollination, external fertilization, and internal fertilization.
Methods/Modes of reproduction by L.ZnerualLanieZnerual
Sexual and asexual reproduction differ in that asexual reproduction involves only one parent and results in offspring that are exact genetic copies, while sexual reproduction requires two parents and the combining of genetic material leads to offspring that are genetically different than the parents. Asexual reproduction methods include binary fission, budding, fragmentation, and parthenogenesis in single-celled and multicellular organisms. Sexual reproduction involves the fertilization of an egg, either externally or internally, requiring both male and female contributions.
Methods of reproduction can be sexual, requiring two parents, or asexual with one parent. Asexual reproduction results in offspring that are exact clones of the parent with little variation. Common asexual reproduction methods include binary fission in single-celled organisms, budding where new growth emerges from the parent, and fragmentation where a parent breaks into pieces that form new individuals. Sexual reproduction requires an egg and sperm and results in offspring with unique genetic combinations from both parents, increasing variation within a species.
Asexual reproduction requires only one parent and produces offspring that are exact genetic copies. This process is faster than sexual reproduction but does not allow for variation and evolution. Common asexual reproduction methods include binary fission, budding, fragmentation, and spore production.
Sexual reproduction requires two parents and the fusion of egg and sperm to produce offspring with unique combinations of genetic material. This process creates genetic variation and drives evolution by allowing populations to adapt to changing environments. Common sexual reproduction methods include pollination, external fertilization in water, and internal fertilization in mammals and other land animals.
Reproduction is the biological process by which organisms produce offspring. There are two main types of reproduction: asexual reproduction, which requires only one parent and produces offspring identical to the parent; and sexual reproduction, which requires two parents and produces offspring with genetic variation. Asexual reproduction occurs through binary fission, budding, or fragmentation, while sexual reproduction can occur through external fertilization, internal fertilization, or pollination.
There are two main types of reproduction: asexual and sexual. Asexual reproduction requires only one parent and produces offspring that are genetically identical clones. It occurs through binary fission, budding, or fragmentation. Sexual reproduction requires two parents and produces offspring with genetic variations from the parents. It can occur through external fertilization in water or internal fertilization within the female's body. Sexual reproduction creates more genetic diversity to help species adapt and survive.
Asexual reproduction allows organisms to reproduce without sex, creating offspring that are genetically identical to the parent. There are several methods of asexual reproduction, including binary fission in single-celled organisms, budding seen in hydra and plants, fragmentation where a parent breaks into pieces that grow into new individuals, and parthenogenesis in some invertebrates and plants where females can produce offspring without fertilization. While asexual reproduction is efficient and produces offspring adapted to the parent's environment, it does not allow for genetic variation and evolution of the species to changing environments.
The document discusses and compares methods of asexual and sexual reproduction. Asexual reproduction requires only one parent and produces offspring that are exact genetic copies. Methods of asexual reproduction include binary fission, budding, fragmentation, and parthenogenesis. Sexual reproduction requires two parents and the combining of genetic material, resulting in offspring that are genetically different than the parents. Methods of sexual reproduction discussed are pollination, external fertilization, and internal fertilization.
This document discusses asexual reproduction, which is reproduction that involves only one parent and produces offspring that are genetically identical to the parent. It describes several forms of asexual reproduction including binary fission, fragmentation, budding, gemmulation, parthenogenesis, sporogenesis, and vegetative propagation. Examples are provided to illustrate each type of asexual reproduction.
Plants can reproduce both sexually and asexually. Sexual reproduction involves the fusion of male and female gametes from two parents, resulting in offspring that are genetically unique combinations of the parents. Asexual reproduction involves a single parent and produces offspring that are genetically identical clones. In plants, common forms of asexual reproduction include budding and production of tubers or spores. Sexual reproduction requires flowers, which typically have male stamens that produce pollen and female pistils. Fertilization occurs when pollen lands on the stigma and a pollen tube delivers the male gamete to fuse with the female gamete, forming a seed.
How Do Organisms Reproduce ? - Class 10 CBSE science (BIo)Amit Choube
Organisms reproduce through both asexual and sexual reproduction. Asexual reproduction involves a single parent and no gamete formation, resulting in offspring that are identical clones. Common asexual reproduction methods include binary fission, budding, and spore formation. Sexual reproduction involves two parents and gamete formation with fusion, leading to genetic variation in offspring. In flowering plants, sexual reproduction involves pollination, fertilization within the ovary, and seed formation. In humans, sexual reproduction becomes possible at puberty when secondary sex characteristics develop. The male reproductive system produces sperm in the testes and transfers them via the penis, while the female reproductive system involves eggs released from ovaries and development within the uterus.
1. Asexual reproduction involves a single parent and produces offspring that are genetically identical. It is common in unicellular organisms and allows for rapid population growth.
2. Sexual reproduction involves two parents and produces offspring with genetic variation. In humans, gametes from the male and female reproductive systems fuse during fertilization, forming a zygote that develops into an embryo.
3. Reproduction, whether asexual or sexual, ensures the continuity of species from one generation to the next. It increases genetic diversity which allows populations to adapt to their environments.
While asexual reproduction only involves one organism, sexual reproduction requires both a male and a female. Some plants and unicellular organisms reproduce asexually. Most mammals and fish use sexual reproduction. Some organisms like corals and komodo dragons can reproduce either sexually or asexually. But in the long term (over several generations), lack of sexual reproduction compromises their ability to adapt to the environment because they do not benefit from the genetic variation introduced by sexual reproduction.
This document compares and contrasts sexual and asexual reproduction. It defines key terms like gametes, fertilization, zygote, and discusses various modes of both sexual reproduction like the fusion of egg and sperm cells, and asexual reproduction like fission, budding, regeneration, and vegetative propagation. The main advantages of sexual reproduction are genetic variation and selective breeding, while the disadvantages include time/energy costs and finding mates. Asexual reproduction enables rapid reproduction without mates but results in uniform offspring lacking genetic variation.
Asexual vs Sexual Reproduction LESSON POWERPOINTKatrinaReyes21
Here is a creature I created that reproduces asexually:
Name: The Blobfish
Description: The Blobfish is a gelatinous creature that lives at the bottom of the ocean. It has no distinct head, limbs, or internal organs. Its body is made of a soft, blob-like mass.
Asexual Reproduction: The Blobfish reproduces through budding. New Blobfish buds form directly on the parent's body. As the buds grow in size, they eventually break off and become independent juvenile Blobfish.
Advantage: Budding allows the Blobfish to rapidly reproduce many identical offspring with little effort or resources. This helps the population grow quickly.
Disadvantage: Because
This document provides information about animal and plant reproduction. It defines sexual and asexual reproduction, and describes the key differences. It explains the processes of pollination and fertilization in flowering plants. It also covers types of asexual reproduction like budding, fragmentation, and fission. Examples are given of asexual reproduction in plants like strawberries and potatoes, as well as in animals like hydra and yeast. The document aims to describe the types and compare methods of animal and plant reproduction.
This document summarizes asexual and sexual reproduction. It describes various forms of asexual reproduction like budding, fragmentation, and regeneration. It also discusses plant asexual reproduction through stems, leaves, and roots. Sexual reproduction requires the fusion of male and female gametes, and can occur externally or internally. Reproduction follows certain patterns and cycles linked to environmental conditions to maximize offspring survival.
Sexual reproduction involves two parents and results in offspring with a genetic mix from both parents using specialized sex cells, while asexual reproduction involves only one parent and produces offspring that are genetically identical using regular body cells. Some organisms can reproduce both sexually and asexually. The advantages and disadvantages of each type of reproduction depend on environmental factors and the ability of organisms to adapt.
REPRODUCTION PROCESS IN ANIMALS AND MEN EXPLAINED COMPLETELY
CHECK FOR GOOD RESULTS
EXPLAINED WITH DIAGRAMS SEXUAL AND ASEXUAL REPRODUCTION]
TYPES OF REPRODUCTION,REGENERATION AND FRAGMENTATION ARE EXPLAINED BRIEFLY.
DNA REPRODUCTION,VEGTATIVE PROPAGATION AND POLLINATION PROCESS EXPLAINED
REPRODUCTION IN HUMAN BEINGS EXPLAINED FULLY FROM TOP TO BOTTOM
Reproduction is a key characteristic of living organisms that allows for the continuation of life across generations. It occurs through both asexual and sexual reproduction. Asexual reproduction involves only one parent and produces offspring that are genetically identical, while sexual reproduction involves two parents and introduces genetic variation. Some common asexual reproduction methods include budding, regeneration, and parthenogenesis. Sexual reproduction results in offspring with a mix of genetic traits from both parents and helps to promote genetic diversity.
Asexual reproduction is a type of reproduction that involves only one parent where the offspring are genetically identical clones. It occurs through several methods including binary fission, budding, regeneration, parthenogenesis, and cloning. The common forms are binary fission where a single parent divides into two identical offspring, budding where new individuals bud off from the parent, and regeneration where a lost body part regrows into a whole new individual.
Asexual reproduction, reproduction in organisms, neet biologyAtoZBiology
Life span refers to the period from birth to natural death of an organism. Reproduction allows organisms to produce offspring similar to themselves. There are two types of reproduction: asexual, which involves a single parent, and sexual, which involves two parents of opposite sex fusing gametes. Asexual reproduction results in offspring that are identical clones of the parent and allows for rapid propagation of organisms.
Sexual reproduction involves the fusion of male and female gametes (sperm and egg) to form a zygote, which undergoes cell division and differentiation during embryogenesis to develop into a new organism. Asexual reproduction does not involve gametes and can involve processes like budding, fragmentation, fission, or spore formation to produce offspring that are genetically identical to the parent. While asexual reproduction is faster, sexual reproduction introduces genetic variation between offspring and parents, which can contribute to evolution of the species over generations.
Ch 01 - Reproduction in Organism || Class 12 ||SAQIB AHMED
The document discusses reproduction in organisms. It defines asexual and sexual reproduction. Asexual reproduction involves mitosis and produces offspring that are genetically identical, while sexual reproduction involves meiosis and the fusion of male and female gametes, producing offspring that show genetic variation. It describes several modes of asexual reproduction including binary fission, budding, spore formation, and vegetative reproduction. It also provides details on the process of sexual reproduction including gametogenesis, gamete transfer, fertilization, and post-fertilization development of the zygote into an embryo.
This document discusses asexual reproduction in plants. It begins by defining asexual reproduction as reproduction that requires only a single parent and does not involve the fusion of gametes. It then discusses various types of asexual reproduction including binary fission, fragmentation, budding, vegetative propagation, and spore formation. The key advantages of asexual reproduction are that it only requires one parent and offspring are produced more quickly than sexual reproduction, allowing for rapid colonization. However, the main disadvantage is lack of genetic diversity, making the offspring and entire species more vulnerable to environmental changes.
A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC
This document discusses three topics related to fertilization: in vitro pollen germination, pollen viability testing, and double fertilization. It explains that pollen can be germinated artificially and the rate depends on medium concentration and cultivar. Pollen viability is measured by staining anthers with dye and counting viable pollen under a microscope. Double fertilization uniquely occurs in flowering plants, where two sperm fuse with nuclei in the ovule - one forms the zygote and the other forms endosperm tissue to nourish the developing seed.
This document discusses asexual reproduction, which is reproduction that involves only one parent and produces offspring that are genetically identical to the parent. It describes several forms of asexual reproduction including binary fission, fragmentation, budding, gemmulation, parthenogenesis, sporogenesis, and vegetative propagation. Examples are provided to illustrate each type of asexual reproduction.
Plants can reproduce both sexually and asexually. Sexual reproduction involves the fusion of male and female gametes from two parents, resulting in offspring that are genetically unique combinations of the parents. Asexual reproduction involves a single parent and produces offspring that are genetically identical clones. In plants, common forms of asexual reproduction include budding and production of tubers or spores. Sexual reproduction requires flowers, which typically have male stamens that produce pollen and female pistils. Fertilization occurs when pollen lands on the stigma and a pollen tube delivers the male gamete to fuse with the female gamete, forming a seed.
How Do Organisms Reproduce ? - Class 10 CBSE science (BIo)Amit Choube
Organisms reproduce through both asexual and sexual reproduction. Asexual reproduction involves a single parent and no gamete formation, resulting in offspring that are identical clones. Common asexual reproduction methods include binary fission, budding, and spore formation. Sexual reproduction involves two parents and gamete formation with fusion, leading to genetic variation in offspring. In flowering plants, sexual reproduction involves pollination, fertilization within the ovary, and seed formation. In humans, sexual reproduction becomes possible at puberty when secondary sex characteristics develop. The male reproductive system produces sperm in the testes and transfers them via the penis, while the female reproductive system involves eggs released from ovaries and development within the uterus.
1. Asexual reproduction involves a single parent and produces offspring that are genetically identical. It is common in unicellular organisms and allows for rapid population growth.
2. Sexual reproduction involves two parents and produces offspring with genetic variation. In humans, gametes from the male and female reproductive systems fuse during fertilization, forming a zygote that develops into an embryo.
3. Reproduction, whether asexual or sexual, ensures the continuity of species from one generation to the next. It increases genetic diversity which allows populations to adapt to their environments.
While asexual reproduction only involves one organism, sexual reproduction requires both a male and a female. Some plants and unicellular organisms reproduce asexually. Most mammals and fish use sexual reproduction. Some organisms like corals and komodo dragons can reproduce either sexually or asexually. But in the long term (over several generations), lack of sexual reproduction compromises their ability to adapt to the environment because they do not benefit from the genetic variation introduced by sexual reproduction.
This document compares and contrasts sexual and asexual reproduction. It defines key terms like gametes, fertilization, zygote, and discusses various modes of both sexual reproduction like the fusion of egg and sperm cells, and asexual reproduction like fission, budding, regeneration, and vegetative propagation. The main advantages of sexual reproduction are genetic variation and selective breeding, while the disadvantages include time/energy costs and finding mates. Asexual reproduction enables rapid reproduction without mates but results in uniform offspring lacking genetic variation.
Asexual vs Sexual Reproduction LESSON POWERPOINTKatrinaReyes21
Here is a creature I created that reproduces asexually:
Name: The Blobfish
Description: The Blobfish is a gelatinous creature that lives at the bottom of the ocean. It has no distinct head, limbs, or internal organs. Its body is made of a soft, blob-like mass.
Asexual Reproduction: The Blobfish reproduces through budding. New Blobfish buds form directly on the parent's body. As the buds grow in size, they eventually break off and become independent juvenile Blobfish.
Advantage: Budding allows the Blobfish to rapidly reproduce many identical offspring with little effort or resources. This helps the population grow quickly.
Disadvantage: Because
This document provides information about animal and plant reproduction. It defines sexual and asexual reproduction, and describes the key differences. It explains the processes of pollination and fertilization in flowering plants. It also covers types of asexual reproduction like budding, fragmentation, and fission. Examples are given of asexual reproduction in plants like strawberries and potatoes, as well as in animals like hydra and yeast. The document aims to describe the types and compare methods of animal and plant reproduction.
This document summarizes asexual and sexual reproduction. It describes various forms of asexual reproduction like budding, fragmentation, and regeneration. It also discusses plant asexual reproduction through stems, leaves, and roots. Sexual reproduction requires the fusion of male and female gametes, and can occur externally or internally. Reproduction follows certain patterns and cycles linked to environmental conditions to maximize offspring survival.
Sexual reproduction involves two parents and results in offspring with a genetic mix from both parents using specialized sex cells, while asexual reproduction involves only one parent and produces offspring that are genetically identical using regular body cells. Some organisms can reproduce both sexually and asexually. The advantages and disadvantages of each type of reproduction depend on environmental factors and the ability of organisms to adapt.
REPRODUCTION PROCESS IN ANIMALS AND MEN EXPLAINED COMPLETELY
CHECK FOR GOOD RESULTS
EXPLAINED WITH DIAGRAMS SEXUAL AND ASEXUAL REPRODUCTION]
TYPES OF REPRODUCTION,REGENERATION AND FRAGMENTATION ARE EXPLAINED BRIEFLY.
DNA REPRODUCTION,VEGTATIVE PROPAGATION AND POLLINATION PROCESS EXPLAINED
REPRODUCTION IN HUMAN BEINGS EXPLAINED FULLY FROM TOP TO BOTTOM
Reproduction is a key characteristic of living organisms that allows for the continuation of life across generations. It occurs through both asexual and sexual reproduction. Asexual reproduction involves only one parent and produces offspring that are genetically identical, while sexual reproduction involves two parents and introduces genetic variation. Some common asexual reproduction methods include budding, regeneration, and parthenogenesis. Sexual reproduction results in offspring with a mix of genetic traits from both parents and helps to promote genetic diversity.
Asexual reproduction is a type of reproduction that involves only one parent where the offspring are genetically identical clones. It occurs through several methods including binary fission, budding, regeneration, parthenogenesis, and cloning. The common forms are binary fission where a single parent divides into two identical offspring, budding where new individuals bud off from the parent, and regeneration where a lost body part regrows into a whole new individual.
Asexual reproduction, reproduction in organisms, neet biologyAtoZBiology
Life span refers to the period from birth to natural death of an organism. Reproduction allows organisms to produce offspring similar to themselves. There are two types of reproduction: asexual, which involves a single parent, and sexual, which involves two parents of opposite sex fusing gametes. Asexual reproduction results in offspring that are identical clones of the parent and allows for rapid propagation of organisms.
Sexual reproduction involves the fusion of male and female gametes (sperm and egg) to form a zygote, which undergoes cell division and differentiation during embryogenesis to develop into a new organism. Asexual reproduction does not involve gametes and can involve processes like budding, fragmentation, fission, or spore formation to produce offspring that are genetically identical to the parent. While asexual reproduction is faster, sexual reproduction introduces genetic variation between offspring and parents, which can contribute to evolution of the species over generations.
Ch 01 - Reproduction in Organism || Class 12 ||SAQIB AHMED
The document discusses reproduction in organisms. It defines asexual and sexual reproduction. Asexual reproduction involves mitosis and produces offspring that are genetically identical, while sexual reproduction involves meiosis and the fusion of male and female gametes, producing offspring that show genetic variation. It describes several modes of asexual reproduction including binary fission, budding, spore formation, and vegetative reproduction. It also provides details on the process of sexual reproduction including gametogenesis, gamete transfer, fertilization, and post-fertilization development of the zygote into an embryo.
This document discusses asexual reproduction in plants. It begins by defining asexual reproduction as reproduction that requires only a single parent and does not involve the fusion of gametes. It then discusses various types of asexual reproduction including binary fission, fragmentation, budding, vegetative propagation, and spore formation. The key advantages of asexual reproduction are that it only requires one parent and offspring are produced more quickly than sexual reproduction, allowing for rapid colonization. However, the main disadvantage is lack of genetic diversity, making the offspring and entire species more vulnerable to environmental changes.
A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC
This document discusses three topics related to fertilization: in vitro pollen germination, pollen viability testing, and double fertilization. It explains that pollen can be germinated artificially and the rate depends on medium concentration and cultivar. Pollen viability is measured by staining anthers with dye and counting viable pollen under a microscope. Double fertilization uniquely occurs in flowering plants, where two sperm fuse with nuclei in the ovule - one forms the zygote and the other forms endosperm tissue to nourish the developing seed.
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6. • When conditions are good, such as plenty
of water, food, right temperatures, etc.,
binary fission is a very effective way of
producing many, many offspring.
• For example, the cell of a Paramecium
can divide, grow, and divide again in the
space of 8 hours.
7. Budding- an offspring grows out
of the body of the parent.
Hydra Budding
offspring
Cactus Budding
8. Yeast - budding
Budding
In yeasts the cell does
not divide equally in
two halves; instead,
there is a large mother
cell and a smaller
daughter cell.
9. Fragmentation
In this form, the body of the parent breaks
into distinct pieces, each of which can
produce an offspring.
Pieces of coral broken off in storms
can grow into new colonies.
A new starfish can grow from
one detached arm.
11. Green plants are quite sophisticated in
their methods of asexual reproduction.
Offspring may be produced by runners,
bulbs, rhizomes or tubers.
12. Parthenogenesis
Parthenogenesis is a form of asexual
reproduction in which females produce eggs that
develop without fertilization. Parthenogenesis is
seen to occur naturally in some invertebrates,
along with several fish, amphibians, and reptiles
as well as in many plants.
There are no known cases of parthenogenesis in
mammals.
13. What is sexual reproduction?
• Requiring 2 parents
– male and female (egg & sperm)
• The egg and sperm join (zygote) to form an
entirely new organism
• Offspring are different from the parent
organism because
15. Methods of sexual reproduction:
Pollination
External Fertilization
Internal Fertilization
16. Pollen is produced in
the male organs of the
flowers - anthers.
Pollination occurs
when pollen is
transferred from the
anthers to the female
organs by wind or by
animals. If the female
stigma is receptive to a
pollen grain, the pollen
produces a pollen tube,
which grows through
the female tissue to the
egg, where
fertilization takes
place by the sperm
nucleus.
Sexual Reproduction
in Flowering Plants
17. External Fertilization
• External fertilization usually requires a
medium such as water, which the sperms
can use to swim towards the egg cell.
External fertilization usually occur in fish
and amphibians.
• The females lay the eggs in the water and
the male squirts the sperm
in the same area.
18. Internal Fertilization
• Fertilization occurs within the female.
• Internal fertilization occurs in mammals,
insects, birds, reptiles.
– Mammals (gorillas, lions, elephants, rats,
zebras, and dolphins have live births)
– Insects, birds, reptiles lay eggs
19. Sexual Reproduction
• Sexual reproduction produces a greater
chance of variation within a species than
asexual reproduction would.
• This variation improves the chances that a
species will adapt to his environment and
survive.
20. Sexual vs. Asexual Reproduction
• Asexual reproduction results in offspring
that are genetically identical to the parent
organism.
• Sexual reproduction results in offspring that
are genetically different from the parent
organisms.
