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In Drosophila, females of wild-type appearance but heterozygous for three autoso

ID: 57368 • Letter: I

Question

In Drosophila, females of wild-type appearance but heterozygous for three autosomal genes are mated to males showing all three autosomal recessive traits: glassy eyes (Ge), coal-colored bodies (Cb) and striped thoraxes (St). One thousand progeny of this cross are distributed in the following phenotypic classes: Which gene is in the middle? Draw a genetic map based on this data showing relative locations of the genes with map distances between them. Calculate the interference value for this region.

Explanation / Answer

a. Glassy eyed (Ge) gene is in the middle as it is changed in the double crossover combination as compared to the parental types.

b. Distance between Ge and Cb is 7.2cM and the between Cb and St is 4.7cM.

c. Interference = 1 - coefficient of coincidence

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