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And then your dad has an x and a y-- I should do it in capital-- and has a Y chromosome. What are all the different combinations of offspring?
Well, your mom could give this X chromosome, in conjunction with this X chromosome from your dad. Your mom could give this other X chromosome with that X chromosome. Well, your mom's always going to be donating an X chromosome. And it works out nicely that half are female and half are male.
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This is almost a trivially easy Punnett square, but it kind of shows what all of the different possibilities are.
So let's say this is your mom's genotype for her sex-determining chromosome. That's what makes her your mom and not your dad.
And then he found a reason to get her essentially decapitated, even though it was all his fault.
He was maybe producing a lot more sperm that looked like that than was looking like this.