Four genes, A, B, C, and D, occur on the same chromosome. Use the following crossover frequencies to determine the order of the genes on the chromosome.
Genes Crossover Frequency
A and D 5%
B and C 15%
A and C 30%
C and D 35%
B and D 50%
A. BCAD
B. CBDA
C. BACD
D. CDAB
E. CBAD
Answer: A. BCAD
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