Question

The following two pedigrees describe the autosomal genetic disorders $P$ and $Q$ in Family $1$ and Family $2$, respectively.

Choose the correct statement from the following options.

• A. Both P and Q are dominant traits
• B. P is a dominant trait and Q is a recessive trait
• C. Both P and Q are recessive traits
• D. P is a recessive trait and Q is a dominant trait

Answer 1

Answer: (B)

Autosomal recessive traits are typically not seen in every generation of an affected family. An autosomal dominant is seen in every generation and affects males and females in the same way. Thus, in the family 1 pedigree, the trait is autosomal dominant (because present in each generation) and in the family 2 pedigree the trait is autosomal recessive (because it is not present in each generation).