It's not perfectly bimodal. Some people are also more and less sensitive to testosterone. The average woman produces testosterone (I know, crazy) with some conditions like polycystic ovarian syndrome causing their testosterone production to go into overdrive.
Some sports actually do test for testosterone in order to determine eligibility (I believe volleyball?)
Also, interestingly enough, people that do estrogen injections end up with lower testosterone production. Estrogen also tends to (but not always!) block the effects of testosterone.
Hormones are weird and how individuals react to them is all over the board.
And example of that craziness is what the article refers to. People with Y chromosomes and uteruses. It's caused (AFAIK) because the fetus didn't respond to the hormones which cause the gonads to turn into male reproductive organs.
That hormone is testosterone. And that means that no matter how much testosterone those people with Y chromosome(s) get, their body cannot use them. Hence, they have a disadvantage even in women sports.
In theory.
The problem is that for example in women boxing these people are overrepresented. This indicates that testosterone is possibly not the only answer, and we don’t know the full picture AFAIK. But of course it’s also possible that simply Y chromosome causes changes in behavior and not physical performance, and it’s more likely that they like boxing more. We don’t know.
The current best proven differentiator AFAIK is testosterone level and whether their body can process that.
Some sports actually do test for testosterone in order to determine eligibility (I believe volleyball?)
Also, interestingly enough, people that do estrogen injections end up with lower testosterone production. Estrogen also tends to (but not always!) block the effects of testosterone.
Hormones are weird and how individuals react to them is all over the board.
And example of that craziness is what the article refers to. People with Y chromosomes and uteruses. It's caused (AFAIK) because the fetus didn't respond to the hormones which cause the gonads to turn into male reproductive organs.