Assume that two genes are 80 map units apart on chromosome II of Drosophila and that a cross is made between a doubly heterozygous female and a homozygous recessive male.What percent recombination would be expected in the offspring of this type of cross?
A)30
B)5
C)50
D)100
E)80

Question

Quizplus · Accepted Answer

The distance between the two genes is 80 map units, which means that there is a 80% chance of recombination occurring between them. This corresponds to a recombination frequency of 0.8, or 80%. Since the two genes are on the same chromosome, the probability of recombination is independent for each gene pair, which means that the cross will produce 50% recombinant offspring. Therefore, the answer is C) 50% recombination.

Assume That Two Genes Are 80 Map Units Apart on Chromosome