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Answer : 2 15 Explanation : Answer: B) 15 Explanation: Here crossing is AaBbCc x AaBbCcAs it is trihybrid cross,we know, Number of zygotes formed = 4n, where n = 343 = 64Given ratio of offsprings = 1 : 6 : m : 20 : m : 6 : 1Now,  1 6 m 20 m 6 1 = 6434 2m = 642m = 30=