Volpe's Understanding Evolution 7th Edition by Peter Rosenbaum

Exercise 7

Interestingly, while the Galapagos finches are now quite diverse, they were likely quite a small sample of the ancestral bird population on the South American coast from which they came. When a small subset of a parental populations forms the foundation of group, we call this an example of
A) Hybrid vigor
B) Reproductive isolation
C) Genetic drift or founder effect
D) Genetic variability
E) Hybrid sterility