Download sexual reproduction

Sexual Reproduction
SEXUAL REPRODUCTION: reproduction involving the
exchange of genetic material between two individuals resulting
in offspring that are genetically different from the parents
-most species of plants and animals reproduce sexually
GAMETE: a sex cell, either female or male, that can unite with
another of form a fertilized cell (zygote) that can develop into a
new individual
-male gametes are called SPERM CELLS
-female gametes are called EGG CELLS or OVA
FERTILIZATION: the union of a female sex cell and a male sex cell
- a ZYGOTE is first formed when the male a and female sex cells unite
- the zygote then divides in two and the divisions repeated during a
process called CLEAVAGE
-the continued cell divisions result in an EMBRYO being formed
-the new organism will show characteristics of both parents
-the development of the embryo may occur inside OR outside
the female parent.
(examples) INSIDE- most mammals like human beings
OUTSIDE- eggs of a chicken
Sexual Reproduction in Plants
Pollination: When pollen is transferred from the anther
to the stigma. This can occur within the same plant.
Cross pollination: Is when the pollen is transferred from a
different plant. Will get characteristics of both plants.
Sexual Reproduction
Asexual Reproduction
can produce a
lot of individuals
very quickly
Two parents
Offspring is
genetically
different than
parent
Do not produce as
many individuals
Takes a lot of
energy and time
Lots of
variation
One parent
Produce
Offspring
Offspring is
genetically
identical to
parent
can be easily
wiped out in
poor
conditions
Questions:
1) What is a zygote?
2) What is cross pollination and how does it occur?
3) What is similar about egg and sperm cells?
4) Why is producing a seed sexual reproduction and producing a spore asexual?
5) Are the offspring in sexual reproduction identical to the parent?