Question

n the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed. Phenotypes Number Observed spineless 441 wild 27 claret, spineless 31 claret 1 claret, hairless 430 hairless, claret, spineless 32 hairless 38 hairless, spineless 0 Which gene is in the middle?

Answer 1

Gene h is in the middle.

Step-by-step explanation:

Phenotype: represented by

spineless: s

hairless: h

claret: c

wild type: +

s + + (parental) + c + (DxO double crossover)

+ c h s + h

s + s +

+ c + c

+ h h + so the one that differs in position is in the middle, and hence, the answer is gene h (hairless)

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