question: Where does a crossover occur on a chromosome?
distractor3: at the same location
distractor1: at no locations
distractor2: at one-two locations
correct_answer: at different locations
support: Figure 17.11 Crossover may occur at different locations on the chromosome. Recombination between genes A and B is more frequent than recombination between genes B and C because genes A and B are farther apart; a crossover is therefore more likely to occur between them.