Washington: Scientists have found that large portions of the X chromosome -long perceived as the "female" counterpart to the male-associated Y chromosome - have evolved to play a specialized role in production of sperm.This surprising finding is paired with another unexpected outcome: despite its reputation as the most stable chromosome of the genome, the X has actually been undergoing relatively swift change.Taken together, these results suggest that it`s time to re-examine the biological and medical importance of the X chromosome.Whitehead Institute Director David Page, whose lab conducted this latest research, said that the team is viewing this as the double life of the X chromosome.He said that the X is the most famous, most intensely studied chromosome in all of human genetics, asserting that the story of the X has been the story of X-linked recessive diseases, such as color blindness, hemophilia, and Duchenne`s muscular dystrophy.
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