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Genetics Question: You have three genes on a genetic map in the order of X, Y,...

Genetics Question: You have three genes on a genetic map in the order of X, Y, and Z. X to Y is 20 cM and Y to Z is 17 cM. However, you see less crossovers than you had anticipated between X and Z. Why is this and how do you find the true rate of recombination between X and Z?

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