
Understanding Super Male Syndrome (XYY)
XYY Syndrome, also called Jacobs Syndrome, is a genetic condition resulting in an extra Y chromosome in males. Find out more about what this means and what you should do.
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Discover your cat's breed, health risks, and ancestry with our guides to the best cat DNA test kits and feline health resources.

XYY Syndrome, also called Jacobs Syndrome, is a genetic condition resulting in an extra Y chromosome in males. Find out more about what this means and what you should do.

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