Sperm in example sentence

And the reason is because in certain individuals, they can actually have genetic changes or mutations that are not passed down from the mother or from the father, but actually start brand new in them, mutations that are present in the egg or the sperm at the time of conception but have not been passed down generation through generation within the family.

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And in this scenario, I want to imagine that, in one case, the sperm is carrying a Y chromosome, meeting that X chromosome of the egg.

And in the other case, the sperm is carrying an X chromosome, meeting the X chromosome of the egg.

It's not just my work in amphibians, but similar work has been shown in fish in Europe, holes in the testes and absence of sperm in reptiles in a group from South America and in rats, an absence of sperm in the testicular tubules as well.

And of course, we don't do these experiments in humans, but just by coincidence, my colleague has shown that men who have low sperm count, low semen quality have significantly more atrazine in their urine.

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