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ATTENDANCE
PRAYER
SEXUAL AND
ASEXUAL
REPRODUCTION
ASEXUAL REPRODUCTION
 It is the reproduction mode where a single
organism (parent) gives rise to its offspring.
 it is the relatively faster reproduction mode because less time and
energy is required in the process.
 The offspring is essentially the clone of the parent as their genetical
makeup is 100% identical.
 Lack of genetic variability in clones makes the species more
vulnerable in extinction when drastic change in environment occur.
 It is a typical in prokaryotic organisms like fungi, protozoa, and
certain plants and animals can also reproduce asexually.
ASEXUAL REPRODUCTION
SEXUAL REPRODUCTION
It is the reproduction mode that involves two
sexually opposite parents – a female and a
male one.
 It involves the union of gametes or sex cells particularly
the egg cell from female and sperm cell from male in the
process called fertilization.
 It is relatively slower reproduction mode because more
energy and time is required in the process.
 The offspring in sexual reproduction has a genetic make
up that is 50%identical to its mother and 50% identical
to its father.
SEXUAL REPRODUCTION
 However the expression of the genetic traits in an offspring is not
straightforward thing because of the existence of dominant and
recessive genes that determine which traits will be expressed or
suppressed.
 A gene refers to the physical and functional unit of heredity which is
found in the deoxyribonucleic acid (DNA) inside the cell’s nucleus.
 Genetic variability may give rise to favorable characteristics that can
make species more resistant to extinction when faced with drastic
changes in its environment.
SEXUAL REPRODUCTION
Asexual vs. Sexual
Reproduction
Match it Up- From your prior knowledge, match up the
two types of reproduction with their characteristics and
place the items a the Venn Diagram in your interactive
notebook
Reproduction Type
Sexual reproduction
Asexual reproduction
 Characteristics
 Two parents
 Identical offspring
 One parent
 Not identical offspring
 Passes on DNA to from parent to
offspring
 Bacteria, protists, some plants, yeast
 Fish, Mammals, Amphibians, Birds,
Reptiles, Insects
11
Make a Venn Diagram 12
Asexual Reproduction Sexual Reproduction
Both
Types of
reproduction
in living
organisms
Pass DNA
from parent
to offspring
Picture Play
Look at each picture and decide whether
it demonstrated asexual or sexual
reproduction and describe why you think
so.
13
14
15
16
She can reproduce the old-fashioned way, by
mating with a male and laying eggs. Or she can
lay eggs without having mated, through a sort of
virgin birth process called parthenogenesis.
17
Asexual Reproduction
 Requires only one parent
 Offspring have 100% the same chromosomes as the parent.
 In other words, the offspring are exact “clones” of the parent.
 Most unicellular organisms
reproduce this way.
 Mitosis
18
Asexual Reproduction
 Binary Fission
 Bacteria
 Protists
19
Binary fission is a form
of asexual reproduction
where every organelle
is copied and the
organism divides in
two.
Asexual Reproduction
 Budding
 Hydra (usually asexual)
20
Budding is a means of
asexual reproduction
whereby a new individual
develops from an
outgrowth of a parent,
splits off, and lives
independently.
Asexual Reproduction- Spore
 Found in fungi, algae, protozoa
 Airborne cells that are released from the parent. They are
enclosed and developed when the environment is
appropriate
21
Asexual Reproduction
 Regeneration
22
Regeneration occurs
when a body part has
broken off and the
organism grows a new
one.
Asexual Reproduction
 Fragmentation
23
Fragmentation is a means of asexual
reproduction whereby a single
parent breaks into parts that
regenerate into whole new
individuals.
Asexual Reproduction
 Plant cuttings/ vegetative
propagation
24
Vegetative reproduction is a type of asexual
reproduction in plants that relies on multi-
cellular structures formed by the parent
plant. It has long been exploited in
horticulture and agriculture, with various
methods employed to multiply stocks of
plants.
Asexual reproduction- Mitosis
 The process where animal cells divide
 This is a type of asexual reproduction
 Body cells (somatic cells) go through
the process of mitosis
 Results in an exact copy of the parent
cell
25
Asexual Reproduction
 Examples of organisms that reproduce asexually
 Hydra
 Sea Star
 Strawberry
 Archaebacteria
 Eubacteria
 Euglena
 Paramecium
 Yeast
26
Sexual Reproduction
 All the members of the Animal Kingdom
 Fish
 Mammals
 Amphibians
 Birds
 Reptiles
 Insects
 Crustaceans
27
Sexual Reproduction
 Requires two parents that each share ½ of the genetic information.
 Offspring share the characteristics of each parent.
 Meiosis
28
Advantages vs Disadvantages of
Asexual Reproduction
Advantages
 Asexual reproduction produces more
offspring
 Asexual reproduction takes less time
 Only one parent involved. No
searching for mates
 Requires less energy
Disadvantages
 Same DNA being passed down NO
GENETIC VARIATION IN THE
OFFSPRING
 If parent has genetic disease offspring
will have it too
29
Advantages vs Disadvantages of
Sexual Reproduction
Advantages
 Variation in offspring
 Organism is more protected because
of genetic variation
Disadvantages
 Requires two organisms. Must find a
mate
 requires more cellular energy
 More time required for offspring
development
30
Sexual Reproduction
 Plant Kingdom
 Flowers are the reproductive organs of plants.
 Some flowers have both male and female reproductive organs on the same
flower.
31
Male flower Female flower
Sexual Reproduction
 Examples of organisms that reproduce sexually
 Chickens
 Iguanas
 Lobsters
 Sharks
 Humans
 Butterflies
 Sunflowers
 Roses
32
Sexual Reproduction
 Happens 2 ways
 Internally (inside)
 The egg is fertilized by sperm inside the female
 Mammals, birds, reptiles, insects, spiders
 Externally (outside)
 The egg is fertilized by sperm outside the female
 The female lays the eggs and then the male fertilizes them.
 Fish and some amphibians
 Plants and fungi (pollen and spores)
33
Summarize
 Write two paragraphs with 6 sentences each describing asexual and sexual
reproduction.
 Paragraph 1: Asexual reproduction is…..
 Paragraph 2: Sexual reproduction is…
34

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sexual and asexual reproduction grade 7.pptx

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  • 5. ASEXUAL REPRODUCTION  It is the reproduction mode where a single organism (parent) gives rise to its offspring.
  • 6.  it is the relatively faster reproduction mode because less time and energy is required in the process.  The offspring is essentially the clone of the parent as their genetical makeup is 100% identical.  Lack of genetic variability in clones makes the species more vulnerable in extinction when drastic change in environment occur.  It is a typical in prokaryotic organisms like fungi, protozoa, and certain plants and animals can also reproduce asexually. ASEXUAL REPRODUCTION
  • 7. SEXUAL REPRODUCTION It is the reproduction mode that involves two sexually opposite parents – a female and a male one.
  • 8.  It involves the union of gametes or sex cells particularly the egg cell from female and sperm cell from male in the process called fertilization.  It is relatively slower reproduction mode because more energy and time is required in the process.  The offspring in sexual reproduction has a genetic make up that is 50%identical to its mother and 50% identical to its father. SEXUAL REPRODUCTION
  • 9.  However the expression of the genetic traits in an offspring is not straightforward thing because of the existence of dominant and recessive genes that determine which traits will be expressed or suppressed.  A gene refers to the physical and functional unit of heredity which is found in the deoxyribonucleic acid (DNA) inside the cell’s nucleus.  Genetic variability may give rise to favorable characteristics that can make species more resistant to extinction when faced with drastic changes in its environment. SEXUAL REPRODUCTION
  • 11. Match it Up- From your prior knowledge, match up the two types of reproduction with their characteristics and place the items a the Venn Diagram in your interactive notebook Reproduction Type Sexual reproduction Asexual reproduction  Characteristics  Two parents  Identical offspring  One parent  Not identical offspring  Passes on DNA to from parent to offspring  Bacteria, protists, some plants, yeast  Fish, Mammals, Amphibians, Birds, Reptiles, Insects 11
  • 12. Make a Venn Diagram 12 Asexual Reproduction Sexual Reproduction Both Types of reproduction in living organisms Pass DNA from parent to offspring
  • 13. Picture Play Look at each picture and decide whether it demonstrated asexual or sexual reproduction and describe why you think so. 13
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  • 17. She can reproduce the old-fashioned way, by mating with a male and laying eggs. Or she can lay eggs without having mated, through a sort of virgin birth process called parthenogenesis. 17
  • 18. Asexual Reproduction  Requires only one parent  Offspring have 100% the same chromosomes as the parent.  In other words, the offspring are exact “clones” of the parent.  Most unicellular organisms reproduce this way.  Mitosis 18
  • 19. Asexual Reproduction  Binary Fission  Bacteria  Protists 19 Binary fission is a form of asexual reproduction where every organelle is copied and the organism divides in two.
  • 20. Asexual Reproduction  Budding  Hydra (usually asexual) 20 Budding is a means of asexual reproduction whereby a new individual develops from an outgrowth of a parent, splits off, and lives independently.
  • 21. Asexual Reproduction- Spore  Found in fungi, algae, protozoa  Airborne cells that are released from the parent. They are enclosed and developed when the environment is appropriate 21
  • 22. Asexual Reproduction  Regeneration 22 Regeneration occurs when a body part has broken off and the organism grows a new one.
  • 23. Asexual Reproduction  Fragmentation 23 Fragmentation is a means of asexual reproduction whereby a single parent breaks into parts that regenerate into whole new individuals.
  • 24. Asexual Reproduction  Plant cuttings/ vegetative propagation 24 Vegetative reproduction is a type of asexual reproduction in plants that relies on multi- cellular structures formed by the parent plant. It has long been exploited in horticulture and agriculture, with various methods employed to multiply stocks of plants.
  • 25. Asexual reproduction- Mitosis  The process where animal cells divide  This is a type of asexual reproduction  Body cells (somatic cells) go through the process of mitosis  Results in an exact copy of the parent cell 25
  • 26. Asexual Reproduction  Examples of organisms that reproduce asexually  Hydra  Sea Star  Strawberry  Archaebacteria  Eubacteria  Euglena  Paramecium  Yeast 26
  • 27. Sexual Reproduction  All the members of the Animal Kingdom  Fish  Mammals  Amphibians  Birds  Reptiles  Insects  Crustaceans 27
  • 28. Sexual Reproduction  Requires two parents that each share ½ of the genetic information.  Offspring share the characteristics of each parent.  Meiosis 28
  • 29. Advantages vs Disadvantages of Asexual Reproduction Advantages  Asexual reproduction produces more offspring  Asexual reproduction takes less time  Only one parent involved. No searching for mates  Requires less energy Disadvantages  Same DNA being passed down NO GENETIC VARIATION IN THE OFFSPRING  If parent has genetic disease offspring will have it too 29
  • 30. Advantages vs Disadvantages of Sexual Reproduction Advantages  Variation in offspring  Organism is more protected because of genetic variation Disadvantages  Requires two organisms. Must find a mate  requires more cellular energy  More time required for offspring development 30
  • 31. Sexual Reproduction  Plant Kingdom  Flowers are the reproductive organs of plants.  Some flowers have both male and female reproductive organs on the same flower. 31 Male flower Female flower
  • 32. Sexual Reproduction  Examples of organisms that reproduce sexually  Chickens  Iguanas  Lobsters  Sharks  Humans  Butterflies  Sunflowers  Roses 32
  • 33. Sexual Reproduction  Happens 2 ways  Internally (inside)  The egg is fertilized by sperm inside the female  Mammals, birds, reptiles, insects, spiders  Externally (outside)  The egg is fertilized by sperm outside the female  The female lays the eggs and then the male fertilizes them.  Fish and some amphibians  Plants and fungi (pollen and spores) 33
  • 34. Summarize  Write two paragraphs with 6 sentences each describing asexual and sexual reproduction.  Paragraph 1: Asexual reproduction is…..  Paragraph 2: Sexual reproduction is… 34