What is the inbreeding coefficient for individual "B" in the following pedigree?

Question

Quizplus · Accepted Answer

To calculate the inbreeding coefficient for individual "B," we need to determine the probability that its two alleles at a given locus are identical by descent. The common ancestor for "B" is on the third generation, so we need to count the number of possible paths from both parents to the common ancestor and then back down to "B." There are four paths, which gives a probability of 1/2^4, or 1/16, for each locus. Since there are two loci, we need to multiply by 2, giving a total inbreeding coefficient of 1/32. Therefore, the best choice is C.

What Is the Inbreeding Coefficient for Individual "B" in the Following