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![[-- sex chromosome --]](Images/Terms/sex_chro.gif)
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| defined: |
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.
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| explained: |
Listen to a detailed explanation.
Lindsay Middelton, R.N., of the National Human Genome Research Institute's Medical Genetics Branch, defines sex chromosome. |
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| illustrated: | View illustration | |
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related terms: |
gene, mutation | |
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