2. Drosophila melanogaster females heterozygous for three linked autosomal genes

Question

2. Drosophila melanogaster females heterozygous for three linked autosomal genes (a,b and c) are testcrossed with triple homozygous recessive males. The map distances are: a-b 5 map units, b-c 11 map units, a-c 16 map units, and the genes are in coupling, that is: all the recessive genes are on the same chromosome. gene order is a-b-c. Answer the following questions (show all work):
A: what percentage of the testcross progeny are genotype abC/abc?

B: what percentage of the testcross progeny are genotype ABC/abc?

C: what percentage of the testcross progeny are genotype AbC/abc?

Explanation / Answer

A. 11%

B. 80% approx

C. DCO cannot be determined without interference values or any other details

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