You are studying 3 genes X,Y,and Z that are linked (and in that order; Y is in t

Question

You are studying 3 genes X,Y,and Z that are linked (and in that order; Y is in the middle). The distance between X and Y is 10 map units and the distance between Y and Z is 8 map units.
If your test cross resulted in 1500 progeny and you observed 5 double crossovers would you conclude that interference has occurred? (Circle one) A. Yes B. No
How much interference occurred? (Circle one) A. 25% B. 28% C. 55% D. 42% E. 58% You are studying 3 genes X,Y,and Z that are linked (and in that order; Y is in the middle). The distance between X and Y is 10 map units and the distance between Y and Z is 8 map units.
If your test cross resulted in 1500 progeny and you observed 5 double crossovers would you conclude that interference has occurred? (Circle one) A. Yes B. No
How much interference occurred? (Circle one) A. 25% B. 28% C. 55% D. 42% E. 58%
If your test cross resulted in 1500 progeny and you observed 5 double crossovers would you conclude that interference has occurred? (Circle one) A. Yes B. No
How much interference occurred? (Circle one) A. 25% B. 28% C. 55% D. 42% E. 58%

Explanation / Answer

In the 1500 total progeny only 5 double crossovers are observed and hence interference has occured. Interference said to be occured when the crossover between 2 genes affects the crossover between other 2 genes. Hence. option A is correct.

The interference is calculated by coeeficient of confidence =1 - observed/ expected double recombinants

c.o.c = 1 - 5 / (0.1) (0.08) (1500) = 1 - 5/12 = 1 - 0.41 = 0.58

Hence. interference occured was 58%. Option E is correct.

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