Each human cell contains 23 pairs of chromosomes that carry DNA within their nucleus. The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair. They determine the ...

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.

In humans and many other animal species, sex is determined by specific chromosomes. How did researchers discover these so-called sex chromosomes? The path from the initial discovery of sex ...

All men and only men have a Y chromosome. This biological fact allows us to trace back in time a direct, largely unchanged genetic line of inheritance from father to son. Every person, male or ...

Among the many marvels of life is the cell's ability to divide and thus enable organisms to grow and renew themselves. For ...

Buckley did note that more work is needed to see how this phenomenon unfolds in the human brain. And in the long term, it ...

The flowerpot snake, one of the world's smallest snakes, has some unusual distinctions. Also known as the Brahminy blind ...

Transcriptionally “silent” Barr bodies maintain gene equality in male (XY) and female (XX) cells. How are these unique sex chromosomes formed? "The sex of a somatic cell as highly ...

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 ...

In animals, including humans, recent studies have highlighted the influence of sex chromosomes on the aging process. Within a species, heterogametic individuals, i.e., those carrying two different ...