試題詳解

22﹒ Inastudy of 100 oogonia undergoing gametogenesis (meiosis), the crossover events between two specific loci, A and B, on a chromosome were analyzed. It was found that 65 gametes show no crossover, 23 show one erossover, 10 show two crossovers， and 2 show three crossovers between loci A and B. What is the estimated genetic map distance between these loci?
(A) 3.5 centimorgans
(B) 6.5 centimorgans
(C) 35 centimorgans
(D) 49 centimorgans
(E) 65 centimorgans