The popular theory that the Y chromosome is well on its way to losing all its genes is wrong, a new study suggests. "Our empirical data fly in the face of the other theories out there," said ...

Men already losing Y chromosomes in their cells Long before the chromosome disappears from the species, many men are already starting to lose it in some of their cells. Starting around age 50 ...

In men, the X, with its SHOX, is fully active. So is the Y. This means that a woman, with her two X chromosomes, will have a slightly lower dose of the SHOX gene than a man, with an X and a Y. As ...