The genes that code for reduced bristles (rbl) and vestigial wings (vg) are located 16 map units apart on Chromosome 2 in the Drosophila melanogaster genome. A homozygous dominant rbl⁺vg⁺ fly with wildtype bristles and wings is crossed with a homozygous recessive rbl vg fly, and one of the resulting F1 heterozygotes is then testcrossed to another homozygous recessive fly. If 400 total progeny flies are produced from the testcross, predict the phenotypic classes and the number of flies expected in each class.

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Predicting Phenotypic Classes and Frequencies in a Drosophila Testcross Scenario A homozygous domina... View the full answer