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Heterogametic sex

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The sex of a species possessing dissimilar sex chromosomes


In humans, the heterogametic sex is the male. The gametes produced may contain either X-chromosome or Y-chromosome.

In other animal species, such as some birds and reptiles, the heterogametic sex is the female. They have two dissimilar sex chromosomes: a W chromosome and a Z chromosome.

Word origin: Greek héteros (other, different)