For example, when examining differences between male and female beetles, American researcher Nettie Stevens recognized patterns of chromosomes that differed between the two sexes. In particular ...

Deep within the cells of mice, a genetic arms race is unfolding between X and Y chromosome genes, battling for dominance in ...

Humanity has been hunting for sex-based differences in the brain since at least the time of the ancient Greeks, and it has largely been an exercise in futility. That's partly because human brains do ...

Excessive X-gene expression is presumed to have decreased female fitness until the X-inactivation system evolved to silence the doubly-dosed genes on one of the X chromosomes in females.

Female (XX) mammals inherit one X chromosome from each parent, but males (XY) receive an X from their mother and a Y sex chromosome from their father. X and Y chromosomes determine not only the ...

two X chromosomes in the nucleus of its original egg cell and it will become a female; a Y and an X chromosome and it will become a male. But exactly what happens in the womb to make a boy or a girl?

Late last month, Stephanie Turner took the knee in protest ahead of her scheduled match against Redmond Sullivan, a ...

For teenage girls, the right of passage into womanhood is straightforward –pimples in the face, periods arriving, breasts filling out – but a few Kenyan girls, never go through this. Thanks to a ...

Researchers have uncovered the mechanism behind the arms race for mouse X and Y bearing sperm to fertilize an egg.

Females have two X chromosomes (XX). Males have one X and ... Only in very rare cases a female will have two recessive alleles and be a sufferer. Affects nerve cells in the brain, leading to ...

World Athletics President Sebastian Coe said the testing plan is “not just talking about the integrity of female, women’s ...