Question

Suppose individual robins that have longer beaks have somewhat more offspring than those with shorter beaks, and that this has led to increases in beak length over time. we can say that beak size is associated with the _______ of the robin, and that there is _______ selection operating on beak size. fitness; stabilizing fitness; directional genetic structure; stabilizing genetic structure; directional genetic structure; disruptiv

Answer 1

The answer is fitness; directional.

The longer beaked robin's are having more offspring, compared to the shorter beaked robins, because they are more fit in that environment. That's probably due to the type of seeds that exist in the environment. That fitness is directional because there is a phenotype that is favored over other phenotypes.