Question 1
A farmer selects the largest animals in the herd as parents for the next generation. When will this work?
The right answer is the one marked above.
Only if their large size is inherited rather than the result of feeding. Selecting the biggest animal is pointless if its size came from being well fed, because only genes are passed to the next generation.
Selective breeding is the first skill of this chapter used deliberately. It selects phenotypes in order to select genotypes, so it works only when the two are connected.