He neglects to mention there is a window to sex development. Yes, a man can produce estrogen and XY cells do respond to some extent to estrogen -- but to develop into a female phenotype an XY fetus must be exposed to estrogen and not testosterone early in the fetal stage. And it is very likely that the hormones a fetus exposes to will "archive" certain genes (in biology parlance, to methylate and heterochromatinize them), making them inaccessible for transcription even though the genes are still present in every cell.
Biology is complex; biology of genetic control an order of magnitude more so. That person (troon?) is brandishing college course 101 material. The flow chart is reasonable however. It would classify Castor Semenya correctly as male.
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I always favor the "flow chart" or "a number of criteria out of many" way of dealing with edge cases of sex identification. To argue there is one single definition that is satisified by every woman and none of men is to play mud wrestling with troons.
From the same person.
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As a biologist that person should know why human beings value reproduction. I don't know why progressives see reproduction as such a dirty word.
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Somehow related to the above.
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