XXYY syndrome

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Notion

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Science and technology

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What Wikipedia says

XXYY syndrome is a sex chromosome anomaly in which males have two extra chromosomes, one X and one Y chromosome. Human cells usually contain two sex chromosomes, one from the mother and one from the father. Usually, females have two X chromosomes (XX) and males have one X and one Y chromosome (XY).

Excerpt from the Wikipedia article “XXYY syndrome”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Silver Spoon, CC BY-SA 3.0, via Wikimedia Commons.