In Drosophila, brittle (b), ebony body (e) and gaucho are three recessive genes.

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

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