Dictionary of Human Evolution and Biology

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Xq Arm

Lower or p-arm of the conservative mammalian X chromosome. The Xq arm appears to have fused with the Xp arm at some point after the divergence of marsupials and placental mammals, as marsupials have unfused Xp and Xq chromosomes. The Xq arm has a smaller proportion of genes that escape inactivation (estimated to be about 1%) than the Xp arm.

See X inactivation.

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