Biology · Genetics
Curled wing (cu), ebony body colour (e), and sepia eye (se) are three recessive mutations in fruit flies. The map distances are cu - e = 20 cM and e - se = 12 cM. The coefficient of interference between these genes is 0.4. A mutant cu e se fly was crossed with a homozygous wild-type fly, and the resulting F1 females were test-crossed, producing 1,800 progeny. What is the expected number of flies in each phenotypic class?
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- 1Non-recombinants: 1250; single crossover (cu-e): 334; single crossover (e-se): 190; double crossover: 26
- 2Non-recombinants: 1181; single crossover (cu-e): 360; single crossover (e-se): 216; double crossover: 43
- 3Non-recombinants: 1198; single crossovers: 576; double crossovers: 26
- 4Non-recombinants: 1233; single crossovers: 524; double crossovers: 43✓
Correct answer
Non-recombinants: 1233; single crossovers: 524; double crossovers: 43
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