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Can an organism with two Y chromosomes exist?

There's xx and xy... the only combination that wee never seen is yy, but why? is it even possible, if not, why? Would it be like a third sex?

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Robin is right. You can't be YY as other answers state. You can be XYY, a male with an extra Y chromosome. These men tend to be aggressive and have a really high rate of violent criminal behaviour.
women are XX so they pass an X chromosome to all offspring. So all offspring have an X chromosome from mom. Girls get an X from Dad, boys get a Y

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It's not possible because two males (the ones with the Y chromosome) cannot have a child together. Scientists are probably trying to find a way to create a third gender but naturally, it is impossible.

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You can't be YY as you state. But some men are XYY See my answer
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I know about that. I was trying to answer their question. I didn't want to get into the whole 3 chromosome explanation. I knew that someone else would.
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it`s not possible because i think either the female of male has one chronosome, and the other person has either x or y and it gives a random chronosome. so i think females have only x, while males have either x or y so yy is not possible.

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Females are XX. Males are XY. However rarely males are XYY. See my answer
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There are people with extra y and x chromosomes and you can learn about that in university or look up superfemales, supermales etc.

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