sex chromosomes

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Related to W chromosome: heterogametic, Z chromosome

sex chromosomes


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The X and Y chromosomes, genetically determining gender: normally XX produces females and XY produces males.
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For instance, in mammals, a tiny Y sex chromosome and a big X yield a male and two Xs make a female, but birds live in a mirror-image world where a big Z chromosome pairs with a tiny W chromosome to yield a female and two Zs make a male.