1. In Drosophila, the recessive mutant allele pr results in purple eyes (pr+: red eyes), and the other recessive mutant allele vg results in vestigial wings (vg+: normal wings). The wildtype alleles of both genes are dominant. The F1 females from the cross between purple-eyed and vestigial-wing females and wildtype males were used in a testcross. The progeny was counted as follows: 1339 in wildtype, 1195 in purple eyes and vestigial wings, 151 in red eyes and vestigial wings, and 154 in purple eyes and normal wings. 1) How do you determine whether these two genes are in the same chromosome (linked) or not?2) What is the frequency of recombination between pr and vg?