All living things reproduce. Reproduction — the process by which
organisms make more organisms like themselves — is one of the things
that sets living things apart from nonliving things. But even though the
reproductive system is essential to keeping a species alive, unlike
other body systems it's not essential to keeping an individual alive.
In the human reproductive process, two kinds of sex cells, or
gametes, are involved. The male gamete, or sperm, and the female gamete,
the egg or ovum, meet in the female's reproductive system to create a
new individual. Both the male and female reproductive systems are essential for reproduction.
Humans, like other organisms, pass certain characteristics of
themselves to the next generation through their genes, the special
carriers of human traits. The genes parents pass along to their
offspring are what make kids similar to others in their family, but
they're also what make each child unique. These genes come from the
father's sperm and the mother's egg, which are produced by the male and
female reproductive systems.
When the
sperm fertilizes, or meets, the egg, this fertilized egg is called the
zygote. The zygote goes through a process of becoming an embryo and
developing into a fetus.
Both the male and female reproductive systems are essential for
reproduction. The female needs a male to fertilize her egg, even though
it is she who carries offspring through pregnancy and childbirth.
Most species have two sexes: male and female. Each sex has its own
unique reproductive system. They are different in shape and structure,
but both are specifically designed to produce, nourish, and transport
either the egg or sperm.