Female Drosophila flies heterozygous for each of three recessive autosomal mutations with independent phenotypic effects (thread eyes [th], hairy legs [h], and scarlet wings [st]) were testcrossed to males showing all three mutant phenotypes. The 1000 progeny of this testcross were the following:
thread, hairy, scarlet 432
thread, hairy 37
thread, scarlet 35
(a) Draw a linkage map that explains this data.
(b) Calculate any relevant interference values.