Which feature is found among an autosomal recessive pedigree?
A) Heterozygotes have a normal phenotype.
B) Affected children will have at least one affected parent.
C) Heterozygotes are affected.
D) Both males and females are affected with equal frequency.
E) The trait is carried on the Y chromosome.

Question

Quizplus · Accepted Answer

In an autosomal recessive pedigree, heterozygotes (carriers) have a normal phenotype because they have one normal allele and one mutated allele, which is not enough to cause the disease. Affected children can have two carrier parents, so it is not necessary for the affected child to have at least one affected parent (B). Heterozygotes are not affected (C). Both males and females can be affected, but the frequency may differ (D). The Y chromosome is not relevant for autosomal inheritance and is only passed down from father to son (E).

Which Feature Is Found Among an Autosomal Recessive Pedigree