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Sexual VS Asexual Reproduction

8th grade science
by

Stephanie Schwind

on 10 January 2014

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Transcript of Sexual VS Asexual Reproduction

Asexual VS Sexual Reproduction
1.Need two parents
-struggle finding a mate
2. Diversity in species
3. Some traits are less favorable and cannot survive in some environments
Pollination

Pollen from the
male is delivered
to female part of
plant
Involves sex cells and fertilization where DNA from 2 individuals merge to form one
Asexual reproduction is based on mitotic division of the nucleus.
--It may be a unicellular organism reproducing itself, or:

--Cells of multicellular organisms that break off to form a new individual

--The offspring are clones—genetically identical to the parent.
-Offspring that are reproduced asexually are genetically identical to the parent

-If there is any variation among the offspring, it is likely due to mutations, or changes in the genetic material.

-Asexual reproduction is rapid and effective and common in nature.
-Other examples of asexual reproduction:
Planaria
Sea Stars and Anemones
Stick bugs
1. Fast and effective process.
--An ameba can produce a new ameba in about 1 hour

2. Offspring are identical to the parent
--Organism perfectly suited to environment needs no improvement

3. Limits the spread of harmful characteristics from generation to generation
daughter
cells
cell begins
to divide
DNA
duplicates
parent cell
1. Only one parent contributes genes to the offspring

2. All offspring are genetically identical to parent

3. Cloning
Definition: -The creation of offspring from a single
(one) parent.
ASEXUAL REPRODUCTION
SEXUAL REPRODUCTION
1. Each parent donates ½ of genes

2. Offspring are similar but not identical
DIVERSITY
Asexual reproduction is an advantage in consistently favorable conditions.
Sexual reproduction is an advantage in changing conditions.

Explain why you think this is—in your notes.
Environment determines what form of reproduction is most advantageous.
1. No variation in offspring does not allow organisms to adapt

2. If every organism is the same, a change in the environment might eliminate an entire species.

3. Harmful genes will be passed on
Budding- forms a new organism from a small projection growing on the surface of the parent.
fission
fragmentation

1. Favorable when the environment changes
2. Diversity ensures survival of a species
3. Lower extinction rates
Asexual Reproduction
Full transcript