XYY syndrome refers to a genetic abnormality in which a male has an extra Y sex chromosome ; characterized by decreased fertility, some genital abnormality, and slight mental retardation.

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Triple X syndrome at psychology-glossary.com■■■■■■■■
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Angelman Syndrome at psychology-glossary.com■■■■■
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Klinefelter syndrome at psychology-glossary.com■■■■■
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Sex-linked genetic abnormalities at psychology-glossary.com■■■■
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Fragile-X syndrome at psychology-glossary.com■■■■
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