Question

Singed bristles (sn), crossveinless wings (cv), and vermillioneye color (v) are due to recessive mutant alleles of three x-linkedgenes in Drosophila melanogaster. When female heterozygous for eachof the three genes was testcrossed with a singed, crossveinless,vermillion male, the following progeny were obtained:

Class Phenotypes Number

1. singed, crossveinless,vermilion 3

2. Crossveinless, vermilion 392

3. Vermilio 34

4. Crossveinless 61

5. singed,crossveinless 32

6. singed,vermilion 65

7. singed 410

8. wild-type 3

Total: 1000

1. Determined the order of these genes

2. Calculate the ,ap distances between the genes

3. Determine the coefficient of coincidence and the interferenceamong these genes.