Morgan’s test-cross analysis of genetic linkage between autosomal genes

(a) Dihybrid F1 females (pr+vg+/ pr vg) are test-crossed to males homozygous for recessive mutant purple eye color and vestigial wing(pr vg/pr vg), permitting identification of progeny as carrying either a parental or a  recombinant chromosome(a) Dihybrid F1 females (pr+vg+/ pr vg) are test-crossed to males homozygous for recessive mutant purple eye color and vestigial wing(pr vg/pr vg), permitting identification of progeny as carrying either a parental or a  recombinant chromosome

(a) % VS]+ Pr‘ V9 Pr .- -. _. -. vg+ pr+ vg pr Red eye Purple eye Full wing Vestigial wing V9+ Pr' V9 Pr -. — -. -. vg pr vg pr Red eye Purple eye Full wing Vestigial wing V9+ Pr‘ V9 Pr V9 Pr’ VQ‘ Pr -. _. -. a. .- m .- m V9 Pr V9 Pr V9 Pr V9 Pr Red eye Purple eye Red eye Purple eye Full wing Vestigial wing Vestigialwing Fullwing l 1339 1195 I 151 154 1339+1195_ 151+154 _ W — 0.893 —2839 — 0.107 Parentals Recombinants