Question 1
Provide a brief definition for positive interference.Question 2
Given that loci A and B in Drosophila are sex-linked and 20 map units apart, what phenotypic frequencies would you expect in male and female offspring resulting from the following crosses? (Assume that A and B are dominant to a and b, respectively.)Answer 1
A crossover in one region decreases the likelihood of crossovers in nearby regions.Answer 2
AaBb (dominant alleles on same chromosome) female X ab/Y male; AaBb (dominant alleles on homologs) female X ab/Y male; aabb female X AB/Y male (no crossing over in male Drosophila)