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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.

Courtesy of the [url=https://www.genome.gov/]National Human Genome Research Institute (genome.gov)[/url].

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.

Courtesy of the National Human Genome Research Institute (genome.gov).

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