Two Parents One Who Is A Iceberg And Balsamic Lover And The Other Who Is Romaine

Two parents, one who is a iceberg and balsamic lover, and the other who is romaine, thousand island lover, are mated. one of the f1 offspring is back-crossed to an iceberg, balsamic lover. if the observed counts of each phenotype from 1000 f2 offspring are: ro-ti = 477; ro-ba = 9; ice-ti = 11; ice-ba = 503; what is the estimated recombination fraction among the two genes?

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