Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while males have one X and one Y. However, there is some evidence that the Y ...

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 ...

Biological sex is all over the news lately. Whether it's via President Trump's executive order affecting passport policy, ...

A new Y chromosome hypothesis explains why the ‘wimpy’ sex chromosome has evaded extinction – by being its own executioner. The Y chromosome is present in only a handful of mammalian species, and is ...

"You either have XX or XY chromosomes," Rep. Nancy Mace, R-S.C., wrote Feb. 20 on X. "Those are the options." Most commonly, a person is born with two X chromosomes (female) or an X and a Y (male).

However, Oetjens and his team at Geisinger College wanted to investigate whether the Y chromosome may also play a role. To ...

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 ...

A test on lab mice may have helped scientists in California debunk a theory that part of the make up of genetics in females ...

The wet diaper test was used to reliably test infants ... Like X-linked dominant diseases, Y chromosome-linked diseases are also extremely rare. Because only males have a Y chromosome and they ...

The name is somewhat of a misnomer because these two chromosomes — dubbed X and Y — have a wide range of responsibilities beyond sex. The X chromosome contains hundreds of genes including many ...

The paper B.A. Sandkam et al., “Extreme Y chromosome polymorphism corresponds to five male reproductive morphs of a freshwater fish,” Nat Eco Evol, 5:939–48, 2021. One of the key stages in the ...