Females have one active X chromosome and one dormant X chromosome in each cell. But a study suggests that genes on the ...

Researchers have shed new light on how a type of heart valve disease—aortic valve stenosis—progresses differently in males and females. The research paves the way for treatments that can be tailored ...

In a related species, Mus triton, both males and females are X0, with males having lost the Y chromosome and females the second X. Taken together, these two species of African pygmy mice open new ...

Human biology is not black and white. Although newborns are typically categorized as male or female at birth based on visible ...

(This article uses ‘women’ and ‘female’ to describe people with two X chromosomes and no Y chromosome, reflecting the language of the study. Nature recognizes that not all people who ...

Many sports federations now have more exclusions for the women's category to limit the participation of transgender athletes.

The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair. They determine the biological sex, reproductive organs, and sexual characteristics that develop in a person.

Biological sex is all over the news lately. Whether it's via President Trump's executive order affecting passport policy, ...

Females, on average, live nearly five years longer than males. They also tend to experience age-related cognitive decline at ...

Within a species, heterogametic individuals, i.e., those carrying two different sex chromosomes ... heterogametic females naturally carrying a Y chromosome (X*Y) than in homogametic XX and ...