A cell with three X chromosomes will contain ________.

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Multiple Choice

A cell with three X chromosomes will contain ________.

Explanation:
X-inactivation in mammals silences all but one X chromosome in female cells, turning the silenced X into a Barr body. Because only one X remains active, the number of Barr bodies equals the number of X chromosomes beyond that first active one. With three X chromosomes, two Xs become Barr bodies while one stays active, so the cell contains two Barr bodies.

X-inactivation in mammals silences all but one X chromosome in female cells, turning the silenced X into a Barr body. Because only one X remains active, the number of Barr bodies equals the number of X chromosomes beyond that first active one. With three X chromosomes, two Xs become Barr bodies while one stays active, so the cell contains two Barr bodies.

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