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Reproduction:
Asexual vs. Sexual
TEKS 7.14B compare the results of uniform or
diverse offspring from sexual reproduction or
asexual reproduction
Reproduction is
important for the
survival of all living
species.
Without a way
to reproduce,
life would
come to an
end.
There are two types
of reproduction,
asexual & sexual.
Sexual
reproduction
Sexual
reproduction
involves
fertilization so
it typically
requires the
sex cells of two
parents.
Advantages of Sexual
Reproduction:
The offspring will be
different from its
parents.
Advantages of Sexual
Reproduction:
Genetic variation
allows the species to
adapt to its
surroundings.
Advantages of Sexual
Reproduction:
“Good” traits are
passed on and
strengthen the
species which
increases their
survival rate.
Advantages of Sexual
Reproduction:
The fertilized
egg can
sometimes
survive in
adverse
conditions.
Disadvantages of Sexual
Reproduction:
Requires two sets of
sex cells (egg and
sperm) usually
produced by two
parents that must get
together to mate.
Disadvantages of Sexual
Reproduction:
Often slower, more
complex & less
reliable than asexual
reproduction.
Examples of Sexual
Reproduction:
Most animals reproduce
sexually. (fly, human,
snake, frog)
Examples of Sexual
Reproduction:
All flowering plants and those
that make seeds reproduce
sexually. (daffodil, grass,
rose, oak tree).
Examples of Sexual
Reproduction:
Fertilization may be
internal (mammals,
birds, reptiles) or
external (frogs,
fish).
Asexual
Reproduction
Asexual
reproduction
involves one
parent & results
in an exact
duplicate of an
organism.
Advantages of Asexual
Reproduction:
Usually faster and
easier, so a new
plant or animal can
colonize an area
more quickly.
Advantages of Asexual
Reproduction:
A mate does not
have to be found
so no travel is
involved which
saves energy.
Advantages of Asexual
Reproduction:
Less complex
and more
reliable.
Advantages of Asexual
Reproduction:
Can produce a
large number of
offspring very
quickly.
Disadvantages of
Asexual Reproduction:
The new organisms
are genetically
identical to their
parent and each
other.
Disadvantages of
Asexual Reproduction:
Adaptation
does not
occur.
Disadvantages of
Asexual Reproduction:
Organisms with
no variation that
cannot adapt
may become
extinct.
Examples of Asexual
Reproduction:
Plants and fungi that
make spores
(mosses, ferns,
mold, mushrooms)
Spores
Examples of Asexual
Reproduction:
Single cells, which
reproduce by binary
fission or splitting in
two (amoeba,
bacteria).
Binary fission
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.
Budding
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.
Runners
Fragmentation: Some
plants, planarian and
other worms can be
split into many
fragments that each
grow into new
identical individuals.
Fragmentation
Regeneration: Type
of fragmentation in
which starfish,
lizards & sponges
can grow back body
parts that are
damaged or lost.