What event causes all female mammals to have one active x chromosome per cell instead of two?

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asked Jul 13, 2018 147k views

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Sylvia · Answer 1 · 2018-07-17T17:50:54+0000

All mammals have at least one X chromosome. Female mammals have two X chromosomes, so each of her eggs has a single X chromosome. Male mammals have XY chromosomes, meaning they can generate sperm containing the X chromosome, or sperm containing the Y. If the egg receives sperm containing the X chromosome, then the resulting individual forms ovaries, and is female.

What event causes all female mammals to have one active x chromosome per cell instead of two?

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