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Sex chromosomes
One of the two chromosomes that specify an organism's genetic sex. Humans have two kinds of sex chromosomes, one called X and the other Y. Normal females possess two X chromosomes and normal males one X and one Y.

Illustration courtesy of the National Human Genome Research Institute.

Sex chromosomes

One of the two chromosomes that specify an organism's genetic sex. Humans have two kinds of sex chromosomes, one called X and the other Y. Normal females possess two X chromosomes and normal males one X and one Y.

Illustration courtesy of the National Human Genome Research Institute.

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