Write your answer in the space provided or on a separate she

Write your answer in the space provided or on a separate sheet of paper. In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that J claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild-type F_1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed: (a) Which gene is in the middle? (b) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous used in making the phenotypically wild F_1 heterozygote?

Solution

(a) HAIRLESS (H gene) gene is in the middle.

S+ S+

+C +C

+H H+

~ THE GENES WHICH DIFFER ARE IN MIDDLE ALWAYS .

(b) cl h +/cl h + and + + sp / + + sp

or

(in easy language) s++/s++ and +ch/+ch

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