Science 5

2. NOT ALL ANIMALS
UNDERGO SEXUAL
REPRODUCTION, DOESN’T
REQUIRE SPERM AND EGG
CELL. EX: JELLYFISH

3. Asexual Reproduction
> The offspring is called clone (has traits
and characteristics that are very identical
to that of the parent)
> Common among plants, single-celled
organisms, and simple animals that do not
need sex cell to reproduce
> EX: hydras, jellyfish, corals, and sponge
sponge
hydra

4. WAYS HOW ANIMALS
REPRODUCE ASEXUALLY
- Allows organism
to grow out of the
body
- Example: hydra,
corals, and yeast

5. PROCESS OF HYDRA’S
REPRODUCTION
-Parent hydra grows a bud
from its body
-Small bud enlarges and
forms tentacles or slim,
flexible limbs used by
animals to move, hold, and
feed
-Newly formed organism
detaches from the parent
hydra and becomes
independent.

7. - Happens when a
piece of an
organism breaks
off
SEA STAR
-When part of it breaks off
due to strong current
-It begins to grow on its own
into an adult with exactly the
same characteristics of the
parent.

8. Sexual reproduction requires the sex cells from a male
and a female parent.
Animals that undergo sexual reproductions: chickens,
goats, and insects (mosquito).
It can carried out into two types:
1. Internal fertilization
2. External fertilization

9. It occurs inside the parent animal’s body.
Evidence is the parent gets pregnant or the tummy gets
bigger.
The offspring grows and develop inside the mother’s body
until birth.
Examples: dogs, cats, cow, chicken, turtles, horses, etc.

10. > Fertilization starts when the
rooster produces sperm cell while
the hen’s ovary produces the egg
cell.
> The egg cell (hen) travels through
a narrow tube called
> When mating the rooster and hen
press their together
to transfer the roster’s sperm cell to
fertilize the hen’s egg cell.
> Once fertilized, it moves to the
uterus where it forms an egg white
and eventually a protective hard
covering called
> The hen lays its eggs and sits on
them until they hatch.

11. Nearly all fish reproduce
by sexual reproduction -
the fusion of sperm
produced from testes and
eggs produced from
ovaries. ... Fertilization is
external in most fish
species. Large quantities
of eggs and sperm are
simultaneously released
into the water by females
and males.

12. Frogs reproduce sexually. That
means that a male frog and a
female frog must be involved. The
male frog has sperm. The female
frog has eggs.
In most species of frogs, fertilization is
external. The male frog grabs the female's
back and fertilizes the eggs as the female
frog releases them. The egg pronucleus and
the sperm pronucleus will meet in the egg
cytoplasm to form the diploid zygotic
nucleus.

13. Estrus ("heat") is the mating
period of female animals.
When estrus occurs, animals
are said to be "in heat" or "in
season." Dogs generally have
their first estrous cycle at 6
to 12 months of age.
Dogs reproduce through the mating
process, where the male mounts the
female during copulation, and after
fertilization, the female experiences a 63-
day gestation period before giving birth to
a litter of puppies. The female dog must
be in the heat cycle in order for the
mating process to be successful.
Cats can reach sexual
maturity and get pregnant at just
four months of age. Cats are
seasonal breeders and only enter
their reproductive cycle at a
certain time of year.

14. Male butterflies find females by
sight, and use chemicals called
at close range. The
male passes a sperm packet called
a spermatorphore to the female.
The sperm then fertilize each
egg as it passes down the female's
egg-laying tube. The fertilized egg
undergo . It is the
life cycle of a butterfly.
- is a protein capsule
containing a mass of spermatozoa,
transferred during mating in various
insects, arthropods, cephalopod
mollusks, etc.