Question

In recombination frequency between AB genes is $20\%$ and BC gene is $40\%$ and interference is $30\%$ in the case of a double crossover then what will be coincidence under this condition?

• A. 2.4
• B. 8
• C. 5.6
• D. 0.7

Answer 1

The correct option is D 0.7

If there is a crossover at one point on a chromosome, it is likely that no crossover will occur in the nearby spot. This phenomenon is called as interference. In this, one crossing over interferes with the coincident occurrence of another crossing over in the same chromosome.

Coefficient of Coincidence = 1 - interference = 1 - 0.3 = 0.7.

Thus, the correct answer is option D.