A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

The female reproductive system is the internal and external organs involved ... are born with two ovaries. The ovaries produce sex hormones and release mature eggs. Once a person reaches puberty ...

They determine the biological sex, reproductive organs, and sexual characteristics that develop in a person ... Since females have two X chromosomes, one may be expressed, or manifest in the ...

A woman in southwestern China who has two reproductive systems has given birth to a wave of fascination across mainland social media. Her condition, coupled with the twists and turns of her life ...