Recall that in Drosophila melanogaster the mutation white blocks the accumulatio

Question

Recall that in Drosophila melanogaster the mutation white blocks the accumulation of ___/16 both eye pigments (causing white eyes, while the mutation vermillion blocks production of the brown pigment (causing bright red eyes. These mutations are both X-linked recessive, and are separated by 31.5 m.u. You perform a parental cross, self the F1, and then score the F2. Given the F2 results presented below, which of these crosses is most likely to be the parental cross from your experiment (circle one). Show X_2 tests to support your answer.

Explanation / Answer

Among their progeny in F2 data, 30% should be recombinant (A b/a b and a B/a b) and 70% should be parental (A B/a b and a b/a b). Therefore, A B/a b should represent 3/4 of the parental, because parental types only recovered and the two genes must be tightly linked to each other and the recombination must be very rare.

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