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Sex Determination



I'm curious now. I know extant birds have chromosomal sex determination that is
the reverse of that in mammals (in birds, males are homozygous and females are
heterozygous). How does it work in other extant sauropsids? Temperature can't
be the only factor, right?

How does sex determination work in extant nonamniote vertebrates? How is
chromosomal sex determiination theorized to have arisen?

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