In this video I go over an example problem of a three-point testcross. I provide the cross information and give the number of progeny with each phenotype. You have to determine the nonrecombinants, recombinants with a single crossover, and recombinants with a double crossover. You then determine recombination frequencies and make the gene map. Finally the double crossover interference is calculated via the coefficient of coincidence.
If you have any questions, let me know in the comments. Thanks and hope you enjoy!
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