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NIH Record - National Institutes of Health
The two sex chromosomes—X (larger pair) and Y.

April 19, 2019

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The X and the Y chromosomes. The X chromosome is the larger pair.

On the Cover

On the cover: Humans typically have two sex chromosomes­—X (larger pair) and Y. Scientists have evidence that millions of years ago, X and Y were the same size and contained essentially the same genes. Now, virtually the only DNA they still have in common is at the very tips (blue).

Photo: Melissa Wilson, Arizona State University

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