Female gonads called ovaries produce the gamete egg.

Male gonads called testes produce the gamete sperm.

The gametes are haploid, consisting of one set (n = 23 in humans) of the genetic material (DNA) organized into chromosomes.

Gametes can fuse by fertilization to form a diploid zygote with two sets (2n = 46) of chromosomes.

The zygote undergoes mitosis to yield the multicellular, diploid adult.

Some diploid cells in gonads undergo meiosis to produce haploid gametes.