this post was submitted on 21 Jan 2025
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I was under the impression that the sperm that fertilizes the egg carries either an X chromosome or Y chromosome and that's what determines male or female. So that would mean conception is in fact when this gets decided, no? What am I missing here?
Sex isn't directly determined by chromosomes, it is determined by someone taking a look at the sex organs. This works for most people, but embryonic development is like most things complicated and there are a lot of factors that make it more difficult than "male" and "female". Examples are people with more than 2 chromosomes or that have absorbed a sibling in the womb. Difference of sex development is estimated to affect 1/100 people.
So when the doc takes a look just before 6 weeks, she must declare "the embryo has ovaries and no testes - female" at every single person. At literal conception: "Idk know, man, it is just 1 cell".
Also, imagine how awkward it is to be the determining doc in that situation.