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X chromosome

Bible DictionaryDictionary of Medicine
The sex chromosome found twice in normal females and singly, along with a Y chromosome, in normal males.
Bible DictionaryRare Diseases Medical Terms
A sex chromosome; normal females carry two X chromosomes.X-inactivation The repression of one of the two X-chromosomes in the somatic cells of females as a method of dosage compensation; at an early embryonic stage in the normal female, one of the two X-chromosomes undergoes inactivation, apparently at random, from this point on all descendent cells will have the same X-chromosome inactivated as the cell from which they arose, thus a female is a mosaic composed of two types of cells, one which expresses only the paternal X-chromosome, and another which expresses only the maternal X-chromosome.

 

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