One in 500 men can carry an extra sex chromosome (most of them unknowingly)

One in 500 men may carry an extra sex chromosome – an X or Y – but it is likely that very few of them know, a new study suggests.

The study, published in the June 9 issue of the journal In Genetic Medicine (Opens in new tab), Including data from more than 207,000 men who provided information to the UK Biobank, a repository of the genetic and health data of half a million participants in the UK. Males usually have an X and Y-shaped sex chromosome in each of their cells, but among the study participants, there were 213 men with an additional X chromosome and 143 with an additional Y.

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