Chapter 19, Problem 16P

In a line of cherry tomatoes, the average fruit weight is $\text{16}$ g. A plant producing tomatoes with an average weight of $\text{12}$ g is used in one self-fertilization cross to produce a line of smaller tomatoes, and a plant producing tomatoes of $\text{24}$ g is used in a second cross to produce larger tomatoes.

a. What is the selection differential (S) for fruit weight in each cross?

b. If narrow sense heritability $\left({\text{h}}^{\text{2}}\right)$ for this trait is $\text{0}\text{.80}$, what are the expected responses to selection (R) for fruit weight in the crosses?