Question

n a series of two-point map crosses involving four genes the following recombinant (single crossover) frequencies...

n a series of two-point map crosses involving four genes the following recombinant (single crossover) frequencies were observed.  

A-D 30

C-B 25

D-B 15

A-C 40

D-C 10

A-B 15

What is the order of the genes if “A” is near one end?

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Answer #1

The recombination frequency is directly proportional to distance between two genes. Hre recombination frequency is highest (40) between A and C gene. So two terminal genes are A and C. Lowest recombination frequency is between D and C. So D is adjacent to C gene. By observing other recombiation frequency it is evident that the correct order of the genes is

A ------B........D...C

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