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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



22﹒ Inastudy of 100 oogonia undergoing g..-阿摩線上測驗