How to calculate distance between gene on a chromosome
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?





