Homogametic


In the inheritance of sex, the homogametic sex is the sex of a species in which the sex chromosomes are the same. It can distinguished from the heterogametic sex. The term is derived from the fact that a homogametic individual can produce only one type of gamete (with respect to sex).

In humans, females are the homogametic sex with the sexual genotype XX (see the XY sex determination system). Conversely, in birds, males are the homogametic sex with the sexual genotype ZZ.