If the interference value is 1 then what is the probability

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.

Solution

Interferance gives a mesure of cross over coincidence with another crossing over in the same pair of chromosomes. Interferance is 1 - Coefficient of coincidence. The coefficience of coincidence decreses the cross over likelihood, if another genes are involved in crossing over. Therefore, the value of Interferance ranges from 0 - 1.

Maximum Interferance (I), i.e 1, then no chance of double cross over, while I = 0, then there is maximum chance of Double cross over. Here the interferance value is 1, therefore probability of recombination between genes A and B is (E) 0.0, as there is recombination between genes B and C