Drosophilia females that are heterozygous for three recessiv

Drosophilia females that are heterozygous for three recessive mutations [e (ebony body), st (scarlet eyes), and ss (spineless bristles)] were testcrossed. and the following progeny were obtained. What is the correct genotype of the heterozygous female fly (the triple heterozygote)? a. e^st^+ ss^+/e st ss b. e^+ ss+ st^+/e ss st c. e st^+ ss^+/e^+ st ss^+ st e. ss^+ e^+ st^+/ss e st What is the map distance between the genes st/st^+ and ss/ss^+? a. 12.2 b. 14 c. 15.3 d. 16.3

Solution

1: Option D
Since two genotypes namely +st+ and e+ss outnumber the otherr genotypes in the progeny, the correct genotype of heterozygous female fly is st + +/+ss e.