In mammals, males have one X chromosome and one Y chromosome and females have two X chromosomes. How is the expression of genes on the X chromosome regulated so that there is equal expression of genes on the X chromosome in males and females?

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    The genes on the X chromosome in males are transcribed twice as fast as in females.
    One X chromosome in females is inactivated so that females have only a single X chromosome capable of transcription.
    The Y chromosome contains balancing genes that help to raise the levels of mRNA produced by the X chromosome in males.
    All of the X chromosomes are inactivated so that no genes are expressed from the X chromosome in either males or females.

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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One X chromosome in females is inactivated so that females have only a single X chromosome capable of transcription.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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