Question

If the interference value is 1, then what is the probability of recombination between genes A and B if: 1.There is a recombination between genes B and C, where the gene order is A-B-C; 2.The recombination fraction between A and B is 0.05; 3.The recombination fraction between B and C is 0.45?
A. 0.45.
B. 0.05.
C. 1.00.
D. 0.15.
E. 0.0.

Answer 1

Answer:

E. 0.0.

Explanation:

The measure of crossing over  coincidence interrelatedness between one cross over and another in a given pair of chromosome is known as what is called Interference.

Given that :

the interference value = 1

The probability of recombination between genes A and B is zero i.e 0.0 because:

when another gene co-occur with a particular gene during cross over, the coefficient of coincidence decreases. We know that the interference is maximum at 1, we can say it ranges from 0-1; now that two recombination is taking place in two genes,the probability is likely to decrease from 1 to 0.0

Similarly;  Since  the probability of recombination is taking place  between two genes i.e genes A and B. Then  there is no probability of  double crossover when interference value = 1 but when it is zero there is probability of double crossover to occur. With that being said, the probability of recombination between genes A and B is 0.0