Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while ...

When Nettie Steven discovered the Y chromosome in 1905 while studying the mealworm Tenebrio molitor, she identified it as a sex-determining chromosome. As it turns out, the chromosome also has ...

If this hereditary tradition has been closely followed, the Y chromosomes of the Cohanim today should bear some resemblance to one another because of their unbroken link back to a common ancestor ...