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Problem: 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. PhenotypesNumber Observedspineless321wild38claret, spineless130claret18claret, hairless309hairless, claret, spineless32hairless140hairless, spineless12What is the correct gene map for these genes?

FREE Expert Solution

Genotypes: The genotypes of the given phenotypes are:

• wing bristles = s+ , s (no bristles)

• eye color = c+, c (black eyes)

• thoracic bristles = h+, h (no bristles)


Parent Generation:

Female = s c+ h+

Male = s+ c h

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Problem Details

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. 

Phenotypes

Number Observed

spineless

321

wild

38

claret, spineless

130

claret

18

claret, hairless

309

hairless, claret, spineless

32

hairless

140

hairless, spineless

12

What is the correct gene map for these genes?

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