Question 5
Two parents, neither of whom has albinism, have a child who does. What does this tell you about the parents?
The right answer is the one marked above.
Both are carriers, each heterozygous for the recessive allele. Albinism is autosomal recessive, so the child must have received the recessive allele from both parents.
Two carriers have a one in four chance of an affected child at each birth. It is the F2 Punnett square, unchanged.