Question

If a recombination event of three points crossing produces 6 DCO, 142 SCO and 352 NCO. What will be the percentage cross over between the terminal genes.

(a) 10%

(b) 20.8%

(c) 14.8%

(d) 30.8%

I got this question by my college director while I was bunking the class.

This is a very interesting question from Linkage and Crossing Over in section Genetic Recombination of Cytogenetics

Answer 1

The correct option is (d) 30.8%

Easy explanation: Recombination frequency between terminal genes will be as {(Single cross over frequency)+2(double cross over frequency)}/100. This will result in 30.8%.