The following pedigree shows the inheritance pattern of a rare recessive disorder with complete penetrance:
A child from marriage between individuals II-2 and II-3 will show the disorder only if the parents carry the recessive allele. What is the probability that the child will show the disorder?
1
1/4, and the probability of the parents to carry the recessive allele is 2/3.
2
1/4, and the probability of the parents to carry the recessive allele is 3/4.
3
1/16, and the probability of the parents to carry the recessive allele is 2/3.
4
1/64, and the probability of the parents to carry the recessive allele is 3/4.