While this internal rivalry is usually hard to see, it becomes clearer when it involves genes on the X and Y chromosomes, ...

In evolutionary terms, fitness is defined as an organism's ability to survive and reproduce its genes into the next ...

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.

Females have two X chromosomes (XX). Males have one X and one Y chromosome (XY). All eggs contain one X chromosome. Half of sperm contain one X chromosome and half contain one Y chromosome.

Alongside hormones, the sex chromosomes — X and Y — are one of the starkest biological differences between males and females, ...

Researchers have shed new light on how a type of heart valve disease -- aortic valve stenosis -- progresses differently in males and females.

Researchers found that a gene on the Y chromosome influences how aortic valve stenosis progresses differently in males and ...

But over the past decade, scientists and funding agencies have pushed for a more comprehensive approach—one that accounts for the influence of X and Y chromosomes in shaping disease. That shift ...