Solutions For An Introduction to Genetic Analysis Chapter 17 Problem 62P

The order of the genes is centromere-d-f-b-x-y-p. The plant produces lesser normal ovules and pollen when compared to the control plant.

a) The abnormal recombination values and the reduced fertility in the aberrant plant can be explained by a hypothesis. The semisterility of the plant suggests an inversion in the order of genes. Since, the d-f and y-p frequencies of recombination in the plant are normal, it indicates that the inversion must involve the segment of DNA from b to x.

b) When an inversion is involved as in the above case, to obtain recombinant progeny, the following scenarios have to be considered:

• Double crossover within the inverted region

• Single crossovers between f and the inversion

The process of double crossover can be shown in the following way:

The process of single crossovers between f and the inversion can be shown in the following way: