Question

If single cross over frequency between two genes r and q and q and s in 3 point mapping is 0.6 and 0.2 respectively. What will be the expected double cross over frequency?

(a) 0.012

(b) 0.010

(c) 0.022

(d) 0.024

I got this question during an online exam.

I would like to ask this question from Linkage and Crossing Over in chapter Genetic Recombination of Cytogenetics

Answer 1

Right choice is (c) 0.022

Explanation: Expected double cross over frequency by probability rule is product of the two single crossover frequencies in three point mapping. Here 20.8X10.0/10000 results on 0.022.