ch cn b
(c) The coefficient of coincidence is the number of observed double crossovers, divided by the number of expected double crossovers. The number of expected double crossovers is obtained by multiplying the probability of a crossover between ch and cn (0.05) X the probability of a crossover between cn and b (0.12) X the total number of progeny in the cross (1800):
coefficient of coincidence
the coefficient of
Finally, the interference is equal to 1 coincidence:
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