Reproduction: Asexual vs. Sexual

1
ReproductionAsexual vs. Sexual
TEKS 7.14B compare the results of uniform or
divers offspring from sexual reproduction or
asexual reproduction
2
Reproduction is important for the survival of all
living species.
3
Without a way to reproduce, life would come to an
end.
4
There are two types of reproduction, asexual
sexual
5
Sexual reproduction
6
Sexual reproduction involves fertilization so it
typically requires the sex cells of two parents.
7
Advantages of Sexual Reproduction
The offspring will be different from its parents.
8
Advantages of Sexual Reproduction
Genetic variation allows the species to adapt to
its surroundings.
9
Advantages of Sexual Reproduction
Good traits are passed on and strengthen the
species which increases their survival rate
10
Disadvantages of Sexual Reproduction

• Requires two sets of sex cells (egg and sperm)
• Which requires two parents that must get together
  to mate

11
Often slower, more complex less reliable than
asexual reproduction.
Disadvantages of Sexual Reproduction
12
Most animals reproduce sexually. (lizards,
humans, chickens, lions, insects)
Examples of Sexual Reproduction
13
All flowering plants and those that make seeds
reproduce sexually. (daffodil, rose, grass, fruit
trees).
Examples of Sexual Reproduction
14
Sexual Reproduction of a Flower
15
Fertilization may be internal (mammals, birds,
reptiles) or external (frogs, fish).
Examples of Sexual Reproduction
Frog Eggs
16
Asexual Reproduction
17
Asexual reproduction involves one parent
results in an exact duplicate of an organism.
18
A mate does not have to be found so no travel is
involved which saves energy.
Advantages of Asexual Reproduction
19
Less complex and more reliable.
Advantages of Asexual Reproduction
20
Can produce a large number of offspring very
quickly.
Advantages of Asexual Reproduction
21
The new organisms are genetically identical to
their parent and each other.
Disadvantages of Asexual Reproduction
22
Adaptation does not occur.
Disadvantages of Asexual Reproduction
23
Organisms with no variation that cannot adapt may
become extinct.
Disadvantages of Asexual Reproduction
24
Examples of Asexual Reproduction
Plants and fungi that make spores (mosses, ferns,
mold, mushrooms)
25
Spores
26
Single cells, which reproduce by binary fission
or splitting in two (amoeba, bacteria).
Examples of Asexual Reproduction
27
Binary fission
28
Budding Spider plants and hydras form new
organisms when part of the parent breaks off to
form a daughter cell that grows into a new
individual that is identical to the parent.
29
Budding
30
Runners Grass and strawberries can form
horizontal stems that grow on top of or just
below the ground which can produce new plants
horizontally at nodes or tips along the stem.
31
Runners
32
Fragmentation Some plants, planarian and other
worms can be split into many fragments that each
grow into new identical individuals.
33
Fragmentation/Regeneration