Drosophila females heterozygous for each of three recessive autosomal mutations with independent phenotypic effects (thread antennae [th], hairy body [h], and scarlet eyes [st]) were testcrossed to males showing all three mutant phenotypes. The 1000 progeny of this testcross were:

hairy, thread 400

scarlet 398

wild type 57

hairy, thread, scarlet 53

thread, scarlet 45

hairy 44

thread 2

hairy, scarlet 1

(A)What is the genotype of the female Drosophila? Show the arrangement of alleles on the relevant chromosomes.

(B)Indicate the distance between each of the three genes. Show the calculations.