Exam 13: How Populations Evolve

After rigorous testing,the Federal Drug Administration (FDA)must decide which of the four antibiotics to approve to fight a bacterial infection that results in high fevers and localized rashes.Which antibiotic do you predict that the FDA scientists will likely approve?

Gene flow is accomplished by ________.

Which of the following is an example that results from directional selection?

In the Hardy-Weinberg formula,what does 2pq represent?

________ believed that use (or lack of use)of body parts enables individual to develop certain traits that it passes on to its offspring while ________ believed that species are fixed forms that do not change over time.

After surviving a bottleneck,a population recovers to the point where it consists of as many individuals as it did prior to the bottleneck.Which of the following statements is most likely to apply to this population?

What can you conclude about the susceptibility of the bacteria to the antibiotics?

Some biologists urge the collection of the few remaining individuals of some of the most threatened amphibian species in order to preserve them if they become extinct in the wild.If such captive-breeding programs could produce thousands of individuals from just a few of the remaining survivors,the species will still be threatened because of ________.

The similarity of the embryos of fish,frogs,birds,and humans is evidence of ________.

Which of the following examples results from stabilizing selection?