Exam 11: Mechanisms of Evolution

Compared to a large mainland population,genetic drift in a small island population is

Gene flow between two populations

A scientist is studying beak length in a species of hummingbird.The scientist establishes a population of birds with beaks ranging from very small to very long and allows the population to breed for 10 years.At the end of the experiment,she finds that the majority of birds in the population have very long beaks.This is an example of the ________ selection pattern of natural selection.

A used car is shipped from Australia to the United States.Stowed away in the trunk of the car is a piece of wood infected with Australian termites.Once in the United States,the buyer of the car finds the rotting wood and dumps it on the side of the road.The termites survive and establish a colony on the side of the road but do not mate with local termite populations.This is an example of