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Biology 10 Online
OpenStudy (anonymous):

what causes variations in sexual organisms?

OpenStudy (anonymous):

I'm not sure exactly which answer you are looking for, A mutation can cause a variation in sexual organisms.

OpenStudy (aaronq):

During gamete formation, recombination ("crossing-over") of genetic material occurs in prophase of meiosis I. This basically "shuffles" genes around.

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