
how do you resolve this exercice ?
- The pedigree below shows the family tree of a family affected by a recessive monogenic disorder that is not sex-linked. If the frequency of heterozygotes in the population in question is negligible, what is the probability that the child in the last generation will have the disorder?
1: 1/16
2: 1/8
3: 1/4
4: 1/2
thanks a lot