SEXUAL
REPRODUCTION
• In humans Sexual reproduction starts
with a process called meiosis. In
women meiosis produces the egg, in
human males meiosis produces
sperm. Eggs need to be fertilized
internally by the sperm in order to
start meiosis phase II. During phase
II both gametes produce a zygote
that is diploid and contains the
genetic information of both parents
making it diploid. The zygote then
goes through mitosis forming two
cells, each with a diploid set. This
process of mitosis continues until
forming a solid ball of cells called the
morula. Mitosis continues until the
ball of cells embeds itself on the wall
of the uterus then pregnancy begins.
• In plants, sexual reproduction occurs
as well. In the gametophyte stage the
plant produces male and female
organs, egg and sperm. When the
egg is fertilized by the sperm it
produces a zygote which goes into a
sporophyte phase and produces
spores. The spores turn into new
gametes. Plants can also fertilize
themselves through a process called
self-fertilization.
•.
ASEXUAL
REPRODUCTION
•Fission- a type of asexual
reproduction in which a single-celled
organism reproduces an identical
reproduction of itself. Fission mostly
occurs in single-celled organisms but
may also occur rarely in some
multicellular organisms.
•Fragmentation- or budding is when
an organisms generates new
fragments of itself and produce new
organisms . An example of this would
be the bulbs of onions
•Regeneration- in regeneration an
organism may regenerate itself from a
piece of the original parent. This can
occur in starfish, plants, or hydra.
Most organisms generate body part
that might be missing or damaged.
BY ELVIA MORALES. PICTURES
FOUND IN GOOGLE IMAGES
HERMAPHRODICTIC
•There are certain organisms that have
both female and male reproductive
organs. Self-fertilization does not
occur with hermaphrodites. One
example of hermaphrodites are
banana slugs. While having sex, both
slugs insert their penis into each
others openings near the head. Snails
are the most common with
simultaneous hermaphrodites. After
sexual intercourse, both snails will lay
fertilized eggs.
•Plants may also be hermaphrodites or
may also be monoecious, having the
female and male in separate flowers
but in the same plant.