The F,G,and H loci are linked in the order written.There are 30 map units between F and G,and 30 map units between G and H.If a plant F G H/f g h is testcrossed,what proportion of progeny plants will be f g h/f g h if there is no interference?
A)0.70
B)0.30
C)0.245
D)0.21
E)0.15

Question

Quizplus · Accepted Answer

The proportion of f g h/f g h progeny can be calculated considering the distances between the loci and using the formula for recombinant frequency. Since F and G, and G and H are each 30 map units apart, the probability of recombination between F and G is 0.30, and the same is true for G and H. For the progeny to be f g h/f g h, there must be no recombination between F and G, and between G and H, which occurs at a probability of (1 - 0.30) for each segment. Thus, the overall probability is (1 - 0.30) * (1 - 0.30) = 0.49 * 0.49 = 0.2401, which is approximately 0.245. This calculation assumes no interference, meaning the occurrence of a crossover in one region does not affect the probability of a crossover in an adjacent region.

The F,G,and H Loci Are Linked in the Order Written