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 Part of a series on Sex X Y chromosome.jpg Biological terms Sexual dimorphism Sexual differentiation Feminization Virilization Sex-determination system XY X0 ZW Z0 Temperature-dependent Haplodiploidy Heterogametic sex Homogametic sex Sex chromosome X chromosome Y chromosome Testis-determining factor Hermaphrodite Sequential hermaphroditism Intersex Sexual reproduction Evolution of sexual reproduction Anisogamy Isogamy Germ cell Meiosis Gametogenesis Spermatogenesis Oogenesis Gamete spermatozoon ovum Fertilization External fertilization Internal fertilization Sexual selection Plant reproduction Fungal reproduction Sexual reproduction in animals Sexual intercourse Copulation Human reproduction Sexuality Plant sexuality Animal sexuality Human sexuality Mechanics Differentiation Activity Sexual orientation - 4 symbols.svg Sex portal Issoria lathonia.jpg Biology portal v t e Organisms of many species are specialized into male and female varieties, each known as a sex.