A species of bird has slight variations in its beak size and shape. Some individuals with bigger beaks are better at cracking seeds. Some individuals with narrower beaks are better at hunting for bugs. An invasive species is introduced that hunts all of the bug population, wiping out that food source for the birds, so all they are left with is seeds.

Question

In one to two sentences, explain how genetic variation from sexual reproduction can save this species from extinction.
(2 points)

Answer 1

Thual reproduction, individuals with a variety of beak sizes and shapes can produce offspring with different traits. This genetic diversity may allow some birds to adapt to the new seed-only diet by having the necessary beak size and shape to crack open the seeds, preventing extinction.