Dictionary of Human Evolution and Biology

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Xp Arm

Upper or p-arm of the conservative mammalian X chromosome. The Xp arm appears to have fused with the Xq arm at some point after the divergence of marsupials and placental mammals, as marsupials have unfused Xp and Xq chromosomes. The Xp arm has a larger proportion of genes that escape inactivation (estimated to be about 15%) than the Xq arm.

See X inactivation.

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