Elon Musk's recent X post defining a woman as someone with a womb has ignited a fierce debate online. While supporters hail ...

We're taught that chromosomes define biological sex: xx = female, and xy = male. However, it's not quite that straightforward. Hank Green hosts as we explain how science proves that biological sex is ...

Human egg cells are often prone to chromosomal errors. As women age, the error rate increases sharply — and can contribute to infertility, pregnancy loss, and ...

In about one out of every 800 people, two chromosomes fuse together to form an unusual bond. These are known as Robertsonian chromosomes. It's a mystery that has long stumped scientists. Now, ...

The Atlas blue butterfly, also known as Polyommatus atlantica, has been genetically confirmed as having the highest number of chromosomes out of all multicellular animals in the world. This insect ...

DANVILLE – A Geisinger study provides new insight into height differences between adult men and women, demonstrating that Y chromosome genes contribute more to height than their X chromosome ...

A school board meeting in California featured emotional debate over transgender athletes being allowed to share locker rooms with high school girls. One girl who cried during a speech was told by the ...

A school board meeting in California featured emotional debate over transgender athletes being allowed to share locker rooms with high-school girls. One girl who cried during a speech was told to ...