Women are born with two X chromosomes and inherit one from each parent. But in every cell of their body, just one X chromosome is needed—so the other is randomly inactivated. Some cells use only ...

X-chromosome inactivation affects age-related decline in spatial memory.

Why do women's brains fare better in aging than men's? A study found that the second, 'silent' X chromosome turns on in the brain of old female mice and improves learning and memory – opening new ...

Male cats, on the other hand, only have one X chromosome, and are therefore much more likely to evenly express that mutation. Whether orange or not, all fur pigmentation genes are X-linked.

The male Y chromosome in humans is evolving faster than the X. Scientists have now discovered the same trend in six species of primate.

Females have one active X chromosome and one dormant X chromosome in each cell. But a study suggests that genes on the dormant X get "reawakened" later in life, potentially giving the brain a boost.

Female mammals typically carry two X chromosomes — one from each parent — and a new study suggests that the maternal X is linked to faster brain aging.

Women are born with two X chromosomes and inherit one from each parent. But in every cell of their body, just one X chromosome is needed – so the other is randomly inactivated. Some cells ...

In a surprise, work in mice has found that the dormant X chromosome in females can reawaken late in life and turn on genes that keep the brain healthy.

Why is the Y chromosome disappearing? The Y chromosome has seen significant changes over the course of human evolution. "In comparison to the X, the Y is tiny.