Two different female Drosophila were isolated, each heterozygous for the autosom

Question

Two different female Drosophila were isolated, each heterozygous for the autosomally linked genes b (black body), d (dachs tarsus), and c (curved wings). These genes are in the order d–b–c, with b being closer to d than to c. Shown here is the genotypic arrangement for each female along with the various gametes formed by both: Female A Female B db+++c d+++bc ? Gamete formation ? (1) d b c (5) d + + (1) d b + (5) d b c (2) + + + (6) + b c (2) + + c (6) + + + (3) + + c (7) d + c (3) d + c (7) d + + (4) d b + (8) + b + (4) + b + (8) + b c

Now rank the frequency of each class of gametes from least frequent to most frequent.

noncrossover

double crossover

single crossover from b to c

single crossover from d to b

Explanation / Answer

Two different female Drosophila were isolated, each heterozygous for the autosom

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