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Two yeast strains differing in three linked genes were crossed: A B C X a b c. Among the terrods that were analyzed, one contained the following...
Two yeast strains differing in three linked genes were crossed: A B C X a b c. Among the terrods that were analyzed, one contained the following spores: A B C, A b C, a B c, and a b c. How did this tetrad originate?