Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 24

In most two-factor crosses involving linked genes, we cannot tell if a double crossover between the two genes has occurred because the offspring will inherit the nonrecombinant pattern of alleles. How does the inability to detect double crossovers affect the calculation of map distance Is map distance underestimated or overestimated because of our inability to detect double crossovers Explain your answer.