In Drosophila, brittle (b), ebony body (e) and gaucho are three recessive genes.
ID: 48739 • Letter: I
Question
In Drosophila, brittle (b), ebony body (e) and gaucho are three recessive genes. If homozygous EBONY females are crossed with homozygous BRITTLE &GAUCHO; males, the resulting F1 progeny are all wild-type. If heterozygous F1 females are mated with EBONY, BRITTLE & GAUCHO males, the f ollowing 1,000 progeny appear brittle, gaucho: 230 ebony: 220 brittle, ebony:8 gaucho: 12 brittle: 120 ebony, gaucho: 110 wild-type: 88 brittle, gaucho, ebony: 92 Denve a map for the three (3) genes. gaucho, ebony: 92
Explanation / Answer
to derive a map we need to follow these steps:-
for ebony it requires EE and for brittle it needs bb and dd
bbdd eedd
so bed is the right sequene