In the fruit fly, Drosophila melanogaster, a spineless ( sp, no wing bristles) f

Question

In the fruit fly, Drosophila melanogaster, a spineless (sp, no wing bristles) female fly is mated to a male that is claret (cl, dark eyes) and hairless (h, no thoracic bristles). Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males, and the following progeny (1000 total) were observed. (wt = wildtype).  Choose the map that best fits the data.

Number Observed Phenotype spineless wild type claret & spineless claret hairless & claret hairless, claret, & spineless h cl sp hairless hairless & spineless hcl sp hcl sp hcl sp h cl sp" h cl sp 321 38 130 18 309 32 140 12 hcl sp h cl sp

Explanation / Answer

Choose the map that best fits the data:

Hairless gene would be in the middle. The distance between sp and h is 10 mu, and the distance between h and cl is 30 mu.

cl------30------h------10------sp

The coefficient of coincidence is 0.03/0.03=1.

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