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Klinefelter syndrome facts for kids

Kids Encyclopedia Facts

Klinefelter syndrome, 47, XXY, or XXY syndrome is a genetic disorder where people have an extra number of X chromosomes. People who have Klinefelter's Syndrome are often called "XXY Males", or "47, XXY Males".


Males who have this condition are almost always infertile. This means that they cannot father babies.

In other organisms

Other males can have Klinefelter's Syndrome as well as humans. The mouse is one example. Tortoiseshell or calico markings on male cats are an indicator of a similar syndrome. These cats are considered to be the model organism for Klinefelter syndrome, because the gene for a cat's tabby coat markings is found on the X chromosome.

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Klinefelter syndrome Facts for Kids. Kiddle Encyclopedia.