Dictionary of Human Evolution and Biology

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Y Chromosome

One of two sex chromosomes in mammals, the segregational homologue of the X chromosome. A single Y chromosome (and X) is normally found in each diploid cell in the heterogametic sex (usually males, in mammals), who are hemizygous for each sex chromosome. Although much of the Y chromosome DNA is homologous with DNA on the X chromosome, only about 5% displays linear synteny, the pseudoautosomal region; the major interior block is the male-specific region of the Y chromosome.

See Y chromosome genes and H-Y antigen.

Cf. X chromosome and autosome.

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