Question

26. Figure 18-12 shows a pedigree for the offspring of a half- sib mating. a. If the inbreeding coefficient for the common ancestor (A) in Figure 18-12 is 1/2, what is the in- breeding coefficient of IP Figure 18-12 is 1/8, what is the inbreeding coefficient of the common ancestor, A?

Answer 1

As A is the common ancestor so the inbreeding coefficient of I is given by-

Inbreeding coefficient = (1/2)ⁿ (* n= number of nodes)

Here n is 3 so inbreeding coefficient is (1/2)³ = 1/8.

Now it is given that inbreeding coefficient of I is 1/8 and we to find the inbreeding coefficient of common ancestor A = (1/8)^1/n , here n is 3 so the answer would be 1/2.