Genetics as it applies to evolution, molecular biology, and medical aspects.

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Post by cbio » Mon Sep 27, 2010 2:18 pm

In Drosophila, ebony body (e) and rough eyes(ro) are encoded by autosomal recessive alleles for genes found on chromosome 3; they are separated by 20cM. The recessive allele for the gene that encodes curly wings(cy) is found on chromosome 2 and assorts independently of e and ro. When an e+ ro+/e ro cy+/cy fly is testcrossed, what proportion of the offspring will have ebony body, smooth eyes and curly wings?

a. 25%
b. 20%
c. 10%
d. 5%
e. 2%

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