Chapter 4.7, Problem 10A

To determine

The percent chance that the child born is susceptible to poison ivy in the Punnett square (column-wise father and row-wise mother) for genetic combinations of two parents if P is the dominant gene whose one copy is enough for a person to be immune to poison ivy and p is the recessive gene whose two copies are required for a person to be susceptible to poison ivy. One parent is susceptible and one is carrier.

$\begin{array}{ccc}& P& p\\ p& pP& pp\\ p& pP& pp\end{array}$