Chromosome Count: Who Gets to Decide Which Athletes Are ‘Feminine Enough’ to Compete?
Chromosome Count: Who Gets to Decide Which Athletes Are ‘Feminine Enough’ to Compete?

msmagazine.com
Chromosome Count: Who Gets to Decide Which Athletes Are ‘Feminine Enough’ to Compete? - Ms. Magazine

While uncommon, XY females do exist. There's Swyer syndrome, and Androgen Insensitivity, among others. Testosterone levels will usually be within normal ranges for XX females and they don't go through a male puberty. Should they be denied the right to participate?
Top female athletes are 140x more likely to have elevated testosterone levels compared to the normal population anyway.
What percentage though? It's a game, so the whole point is to make the playing field as even as possible. It sucks if you don't have the qualifying DNA to compete in the women's league and you really want to. Perhaps if there's enough demand they could start up a new league. For those with non typical sex chromosomes.
Cause its pretty hard to check around 28 trillion cells for the presence of a single xy chromosome.
Humans are mushy by design, its essentially impossible to draw a line like this