Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 30

Researchers have discovered that some regions of chromosomes are much more likely than others to cross over. We might call such a region a "hot spot" for crossing over. Let's suppose that two genes, gene A and gene B , are 5,000,000 bp apart on the same chromosome. Genes A and B are in a hot spot for crossing over. Two other genes, let's call them gene C and gene D , are also 5,000,000 bp apart but are not in a hot spot for recombination. If we conducted two-factor crosses to compute the map distance between genes A and B , and other two-factor crosses to compute the map distance between genes C and D , would the map distances be the same between A and B compared with C and D Explain.