XYYY syndrome

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What Wikipedia says

XYYY syndrome, also known as 48,XYYY, is a chromosomal disorder in which a male has two extra copies of the Y chromosome. The syndrome is exceptionally rare, with only twelve recorded cases. The presentation of the syndrome is heterogeneous, but appears to be more severe than its counterpart XYY syndrome.

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

Image: Maryam Abedi, Arash Salmaninejad, Ebrahim Sakhinia, CC BY 4.0, via Wikimedia Commons.