Genes and Chromosomes

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Learn about genes, chromosomes and karyotypes in this video!
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Except non-XX/XY sex chromosomes *do* exist, for example X, XO, XXY, XXYY.

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The phrase "DNA has sections that don't seem to do anything" is technically correct but misleading and neglects important information. As time goes on, more and more "useless" sections are being found to be important in one capacity or another, and so the aforementioned phrase is most certainly a dangerous and unscientific perspective.

jgates