Most amphibians have external fertilization and external develoment as their chief mode of development. Fertilization occurs when the egg and sperm fuse and join. The egg of the female is much smaller than the sperm. The egg is able to move under its own power by its flagellum in the human. The male gonads are called the testes and the female gonads are called the ovaries.
Gonads are organs which produce sex cells.
The human egg or sperm contains 92 chromosomes. Crossing over involves an exchange of chromatid segments between chromosomes. The first division of meiosis is when crossing over occurs. Spermatogenesis occurs in the prostate gland. The head of a human sperm contains much stored food to provide the sperm with energy.