Sex-determination system
Biological system that determines the development of an organism's sex
Sex-determination system
A sex-determination system is a biological system that determines the development of an organism's sex. Most organisms that create their offspring using sexual reproduction have two sexes, males and females. In other species there are hermaphrodites, organisms that can function as female, male, or both. In some species, only one sex is present, temporarily or permanently. This can be due to parthenogenesis, where a female reproduces without fertilization, mostly seen in plants. In some plants or algae the gametophyte stage may reproduce itself, thus producing more individuals of the same sex as the parent. Sex determination is often genetic: males and females have different alleles or even different genes that specify their sexual morphology. In animals, this is often accompanied by chromosomal differences through combinations of XY, ZW, XO, ZO chromosomes, or by haplodiploidy. The sexual differentiation is triggered by a main gene (a "sex locus"), with a multitude of other genes following...
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