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How to calculate distance between gene on a chromosome

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Assume that the genes for tan body and bare wings are 15 map units apart on chromosome II in Drosophila. Assume also that a tan-bodied, bare-winged female was mated to a wild type male and the resulting F1 phenotypically wild type females were mated to tan-bodied, bare- winged males. Of 1000 offspring, what would be the expected phenotypes and in what numbers would they be expected?

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Solution Summary

Number of recombinants is directly proportional to the distance between genes in map unit. This relationship is utilize in calculating the number of phenotypes.

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