In a Species of Drosophila,genes Q and R Are Found

Multiple Choice

In a species of Drosophila,genes q and r are found on the same chromosome 20 centimorgans apart.A cross was made between the following individuals: What proportion of the offspring would you expect to have the wild-type phenotype?

A) 0.10
B) 0.20
C) 0.40
D) 0.80
E) None of these