Most people have 46 chromosomes in each cell. In males, this typically includes one X chromosome and one Y chromosome (XY). XYY syndrome is a genetic condition that occurs when a male has an extra ...

‌Although genetics are hereditary, a phenomenon in genetic alterations occurs when male babies receive an extra Y chromosome in each of their cells, resulting in an XYY combination. The syndrome is ...

The first five above are the most common physical exam findings. However, because these characteristics can fall within the normal range for males, often those with XYY syndrome do not get diagnosed.

Former model turned novelist Annabel Giles, 49, married Midge Ure, 55, the lead singer of pop band Ultravox, in 1986. They separated in 1991 and have one daughter, Molly, now 21. Annabel's second ...

Superman syndrome, also known as 47, XYY, is a condition classified as a chromosomal aneuploidy (which is an abnormality in chromosome structure and/or number) in which males have an additional Y ...

When news breaks, you need to understand what actually matters. At Vox, our mission is to help you make sense of the world — and that work has never been more vital. But we can’t do it on our own. We ...

A microscopic piece of genetic material known as the Y chromosome made headlines last week. It is nothing new or rare; every man has one in practically every cell, or he would not be a man. But a few ...

A woman in China is preparing to abort her baby boy after being told he has a condition which many people mistakenly believe means he will grow up with aggressive and violent tendencies. Prenatal ...