Women have a higher proportion of key immune cells between puberty and menopause, which may be linked to the sex hormone estrogen and explain why they are less susceptible to certain infectious ...

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.

The Trump Administration’s definition of biological sex does not accurately reflect modern science.

However, when they analysed samples from transgender females (XY chromosomal background ... said: “The X chromosome carries numerous genes that are important for human immune responses, so it was ...

Post readers dive into transgender issues in sports, science and more.

Each human cell contains 23 pairs of chromosomes that carry DNA within their nucleus. ... (XX) mammals inherit one X chromosome from each parent, but males (XY) ...

World Athletics, the body that governs track and field as well as road-running events, will demand DNA tests for athletes competing in the female category in elite events.

Picture: iStock By contrast, men are more likely to be exposed to the same types of mutations because their XY ... the chromosome pattern is the other way around — as in the case of humans ...

The U.S. Department of Education issued a "final warning" to Maine's Department of Education Monday, saying the Trump administration's next step is legal action if state officials do not ban ...