The order of the genes on a plant chromosome is A, B, C, where A and B are located 10 cM apart and B and C are located 3 cM apart. What is the probability that the trihybrid ABC/abc will produce any kind of recombinant gamete?
A) 0.30%
B) 87.30%
C) 1.27%
D) 8.73%
E) 12.70%

Question

Quizplus · Accepted Answer

The probability of producing a recombinant gamete is the sum of the recombination frequencies between A-B and B-C. The recombination frequency between A and B is 10% (0.10) and between B and C is 3% (0.03). The probability of a double crossover is negligible, so the total probability is 0.10 + 0.03 = 0.13 or 13%. However, since the question asks for any kind of recombinant gamete, we consider the non-recombinant gametes as well, leading to a probability of 12.70% for recombinant gametes.

The Order of the Genes on a Plant Chromosome Is