This document defines asexual reproduction and describes its various types. It explains that asexual reproduction involves a single parent producing offspring that are genetically identical. Various types of asexual reproduction are described, including fission, fragmentation, budding, parthenogenesis, spore production, and vegetative propagation. Examples of each type are provided. The objectives are to define asexual reproduction, describe its different types, and classify organisms by their reproductive methods.
BIODIVERSITY AND EVOLUTION
POPULATION
IMPORTANT ASPECTS OF POPULATION
BIRTH- Natural process in which parents give rise to new offspring.
DEATH- Reduces the number of existing individuals in a population.
MIGRATION- Movement of individuals into or out of the population.
IMMIGRATION- Movement of individuals into the population.
EMIGRATION- Movement of individuals out of the population.
PATTERNS OF POPULATION GROWTH
BIOTIC POTENTIAL- Maximum reproductive capacity of an organism given that the resources are unlimited.
EXPONENTIAL GROWTH- Capacity of a population to increase continuously without showing any signs of stabling or declining.
FACTORS THAT AFFECT POPULATION GROWTH OR SIZE
LIMITING FACTORS
-control the growth, size, and distribution of organisms
COMPETITION
ABIOTIC FACTORS
PREDATOR-PREY RELATIOSHIP
POPULATION DENSITY
EXTINCTION
Some famous mass extinction events
Causes of Extinction
BIODIVERSITY AND EVOLUTION
POPULATION
IMPORTANT ASPECTS OF POPULATION
BIRTH- Natural process in which parents give rise to new offspring.
DEATH- Reduces the number of existing individuals in a population.
MIGRATION- Movement of individuals into or out of the population.
IMMIGRATION- Movement of individuals into the population.
EMIGRATION- Movement of individuals out of the population.
PATTERNS OF POPULATION GROWTH
BIOTIC POTENTIAL- Maximum reproductive capacity of an organism given that the resources are unlimited.
EXPONENTIAL GROWTH- Capacity of a population to increase continuously without showing any signs of stabling or declining.
FACTORS THAT AFFECT POPULATION GROWTH OR SIZE
LIMITING FACTORS
-control the growth, size, and distribution of organisms
COMPETITION
ABIOTIC FACTORS
PREDATOR-PREY RELATIOSHIP
POPULATION DENSITY
EXTINCTION
Some famous mass extinction events
Causes of Extinction
Unit 4, Lesson 4.5 - Sexual Reproduction in Animalsjudan1970
Unit 4, Lesson 4.5 - Sexual Reproduction in Animals
Lesson Outline:
1. Internal and External Fertilization
2. Internal and External Development
3. Sexual Reproduction Among Some Animals
4. Sexual vs. Asexual Reproduction
Edited PowerPoint presentation of Jean Baptiste Lamarck's theory of inheritance of acquired characters
This PowerPoint presentation is collected from different websites and PowerPoint presentation
Grade 8 Integrated Science Chapter 15 Lesson 2 on volcanoes. This lesson goes into detail about volcanoes, plate boundaries, lava chemistry, eruption types, and volcano types. The purpose of this lesson is for students to understand where and why volcanoes form and what factors cause differing volcanic features.
A fault is a break or fracture between two blocks of rocks in response to stress.
One block has moved relative to the other block.
The surface along which the blocks move is called a fault plane.
Faulting produced the earthquakes.
Thus earthquakes may occur because:
a) Rocks are initially broken to produce a fault.
b) Movement or re-activation of an already existing fault.
Unit 4, Lesson 4.5 - Sexual Reproduction in Animalsjudan1970
Unit 4, Lesson 4.5 - Sexual Reproduction in Animals
Lesson Outline:
1. Internal and External Fertilization
2. Internal and External Development
3. Sexual Reproduction Among Some Animals
4. Sexual vs. Asexual Reproduction
Edited PowerPoint presentation of Jean Baptiste Lamarck's theory of inheritance of acquired characters
This PowerPoint presentation is collected from different websites and PowerPoint presentation
Grade 8 Integrated Science Chapter 15 Lesson 2 on volcanoes. This lesson goes into detail about volcanoes, plate boundaries, lava chemistry, eruption types, and volcano types. The purpose of this lesson is for students to understand where and why volcanoes form and what factors cause differing volcanic features.
A fault is a break or fracture between two blocks of rocks in response to stress.
One block has moved relative to the other block.
The surface along which the blocks move is called a fault plane.
Faulting produced the earthquakes.
Thus earthquakes may occur because:
a) Rocks are initially broken to produce a fault.
b) Movement or re-activation of an already existing fault.
Asexual reproduction is a process in which new organism is produced from a single parent without the involvement of gametes or cells. Many unicellular and multi cellular organisms reproduce asexually.
Reproduction In Living Beings Class - 10thNehaRohtagi1
PowerPoint Presentation on the topic - 'Reproduction In Living Beings'. For Class:- 10th
Created By - 'Neha Rohtagi'.
I hope that you will found this presentation useful and it will help you out for your concept understanding.
Thank You!
Please give feedbacks and suggestions to get presentations on more interesting topics.
How Do Organisms Reproduce ? - Class 10 CBSE science (BIo)Amit Choube
Reproduction is an integral feature of all living beings. The process by which a living being produces its own like is called reproduction.
Importance of Reproduction:
Reproduction is important for each species, because this is the only way for a living being to continue its lineage. Apart from being important for a particular individual, reproduction is also important for the whole ecosystem. Reproduction helps in maintaining a proper balance among various biotic constituents of the ecosystem. Moreover, reproduction also facilitates evolution because variations come through reproduction; over several generations.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
2. OBJECTIVES: After going through this lesson, the learner should be able to:
•define asexual reproduction;
•describe the different types of asexual
reproductions;
•classify organisms according to their methods of
reproduction
3. Why the cell is considered the basic structural and functional
unit of all organisms?
5. Asexual Reproduction
• Occurs when only one parent produces an offspring which has the
exact genetic make-up with the parent.
• Mostly occurs in single - celled organisms such as bacteria; some
multicellular organisms such as fungi; and some plants.
6. TYPES OF ASEXUAL REPRODUCTION:
1. Fission
2. Fragmentation
3. Budding
4. Parthenogenesis
5. Spore production
6. Vegetative propagation
a. Rhizomes
b. Runners
c. Bulbs
d. Tubers
e. Corms
f. Plantlets
7. Fission
• The cell divides to form two identical daughter cells.
• Each daughter cell grows until it becomes as large as the parent cell.
• Example: Amoeba cell reproduces by dividing.
8.
9. Fragmentation
• Severed parts of the organisms grow into another organism similar to it.
Examples: starfish, planaria, spirogya, hydra parent starfish
new starfish
fragment arm
regenerating arm
• A young starfish can develop from a single fragment of its arm.
10.
11. Budding
• New identical individual forms as an outgrowth of the parent.
• The outgrowth detaches from the parent and becomes a new individual.
Example: yeast, hydra, and sponges
new
buds
Budding in yeast
12.
13. Parthenogenesis
• occurs when an embryo develops from an unfertilized cell. It occurs in
invertebrates, as well as in some fish, amphibians, and reptiles.
Baby Komodo dragon produced through parthenogenesis.
14. Spore production
• Spores are stored in sacs called Sporangia.
• When the Sporangia bursts open; minute single-celled structures called spores are released.
• Under favorable conditions, these spores develop into a new identical organism.
Example: bread mold (alamag), mushrooms
A species of bread mold ( Rhizopus stolonifer) and a common mushroom produce spores to reproduce
15.
16. Vegetative propagation
• Form of asexual reproduction in plants that occurs when a new plant
develops from a fragment of the parent plant or a specialized
reproductive structure (rhizome, tuber, corm, or bulb)
• Example: sweet potato, cassava, banana,tao etc…
17. Rhizomes
• is a modified subterranean plant stem that sends out roots and
shoots from its nodes.
Ginger (luya) bamboo
18. Runners
• Moreover known as stolons, runners are specialized stems that, not at all like rhizomes, develop
from existing stems just underneath the soil surface.
runner
Straw berry silver weed
19. Bulb
• are swollen parts of the stem inside which lie the central shoots of new plants. They are usually
underground and are surrounded by plump and layered leaves that provide nourishment to the
new plant.
Shallots onions
20. Tubers
• emerge from either the stem or the root of the plant. Stem tubers develop from rhizomes or
runners that swell from storing nutrients while root tubers develop from roots that are modified
to store nutrients and get too large and produce a new plant.
• Examples of stem tubers are potatoes and yams or locally known as ube, apari.
Potatoes yam (ube)
21. Corms
• The solid, enlarged underground stems that store nutrients in their fleshy and solid stem tissue
are called corms. They are surrounded by papery leaves. Corms vary from bulbs in that their
centers comprises of strong tissue whereas bulbs comprise of layered clears out. Example of
plants that use corm is taro (gabi).
Taro plant (gaway)
22. Plantlets
• The miniature structures that arise from meristem in leaf margins ic referred to as plantlets. They
eventually develop roots and drop from the “mother leaf” or the leaves they grew on.
Bryophyllum daigremontianum (syn. Kalanchoe daigremontianum), also known as mother of
thousands is an example of a plant that uses plantlets to propagate. Katakataka plant is another
example for this.
new leaf with roots
Mother of thousands
23. GENERALIZATION:
• How do you define asexual reproduction based on the given
information?
• Can an organism reproduce new organism alone?
24. • Directions: Classify the following organisms according to their method of reproduction. Choose from the
choices in the box.
APPLICATION: Activity 1. How Do I Reproduce?
Binary fission Budding formation fragmentation
Spore formation vegetation
yeast
budding
molds
Spore formation
sweet potato
vegetation
amoeba
binary fission
star fish
fragmentation
25. EVALUATION:
• Directions: Choose the best answer from the given choices. Write the letter of your choice on
your activity notebook.
1. Which of the following statements correctly describes asexual reproduction?
I. Offspring are genetically unique
II. Offspring are genetically identical to parent
III. A male and female is needed to produce offspring
IV. One parent is needed to reproduce.
V. It only occurs in plants and bacteria.
a) I and III only
b) II and IV only
c) I, IV and V only
d) II, IV and V only
26. 2. How many parents are needed in asexual reproduction?
a) 1
b) 2
c) 3
d) 4
27. 3. How do bacteria make the next generation?
a) Budding
b) Sexually
c) Fragmentation
d) Binary Fission
28. 4. Which of the following is a DISADVANTAGE of asexual
reproduction?
a) There is great variation among the offspring.
b) Offspring will get all good characteristics of parents.
c) Offspring have difficulty in adapting to new environment.
d) Adapting to the environment is always constant among the offspring.
29. 5. If you cut a starfish into two pieces, each piece
develops into anew starfish. What type of asexual
reproduction is this?
a) Budding
b) Fragmentation
c) Spore Formation
d) Vegetative Propagation
30. 6. Which of the following is known as the
horizontal runners in strawberries?
a) Buds
b) Clones
c) Stolons
d) Roots
31. 7. The diagrams below represent various processes
associated with reproduction. Which of the following
represent asexual reproduction?
a) I and II only
b) II and III only
c) I, III and IV only
d) I, II, III and IV
I II III IV
32. 8. Which of the following is the starting point of an
offspring of a budding organism?
a) Colony of clones
b) Unfertilized egg cell
c) Cutting from the parent
d) Growth on the parent’s body
33. 9. Which of the following words is another term for
regeneration?
a) Communication
b) Defense
c) Healing
d) Movement
34. 10. An offspring is produced through asexual
reproduction. Which of the following best describes the
offspring’s genetic material?
a) Completely unrelated to its parents.
b) Identical to the genetic material of one parent.
c) A copy of the genetic material of one parent.
d) A combination of the genetic material of its parents.
35. ASSIGNMENT:
• During TABO in Gandara every Sunday kindly list at least 5 organism you will find and identify
their mode of asexual reproduction and state your reason/s as well. Please refer to the example
given.
ORGANISM
MODE OF ASEXUAL REPRODUCTION
REASON/S
Example: banana (aldaba) corm It has solid under ground stems that store nutrients in their fleshy and solid
stem tissue.
1.
2.
3.
4.
5.