The purpose of reproduction is
to ensure the continuation of a species. Sexual reproduction between
male and female allows the assortment of genes, and therefore
variability within a species.
In this Lesson, well see
that fertilization may be either external or internal. Aquatic and
amphibian animals usually fertilize externally, using water as a
medium in which the sperm swims to the egg. Terrestrial animals
normally fertilize internally.
The processes of
spermatogenesis and oogenesis produce haploid sperm and eggs in the
testes and ovaries respectively. Well see how the male and female
reproductive organs of vertebrates are adapted to facilitate the
union of sperm and egg.
Vertebrate reproductive systems
are under the control of an interacting group of hormones. Well
look at these hormone interactions in the male and female
reproductive systems of humans.