Exam 11: Mechanisms of Evolution

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

Which of the following is NOT a mode of natural selection?

During gene flow,

A student with Strep throat (caused by a strain of bacterium) is given a prescription for an antibiotic and is told to take the drug for two weeks. After a week, the student feels better and stops taking the drug. Two months later, the student again shows symptoms of Strep throat and decides to finish the leftover antibiotic rather than going to the doctor again. Two months later, the student develops Strep throat for a third time and returns to the doctor. This time, the antibiotic does not work. The doctor runs a test and discovers that the bacterial strain the student is carrying is antibiotic resistant. What most likely happened?

Match each example to one of the processes below. -Overfishing results in an endangered fish population with a very small population size.

Which of the following statements concerning evolution is FALSE?

Although millions of prairie chickens once occupied Illinois, in 1993 only 50 remained. Starting in 1992, scientists moved almost 300 prairie chickens from large populations in other states to Illinois to ________ Illinois prairie chicken populations.

A gene has two alleles, D and d. The frequency of the D allele is 0.2. What is the frequency of the d allele?

Evaluate the accuracy of the following statement: Individuals evolve by becoming more adapted to their environment. Explain how you reached your conclusion.

For a population to evolve, there must be genetic differences between organisms in that population. These differences arise by

What is the total number of alleles present for any given gene in a population of 100 individuals?

Two unrelated species evolving to look more similar due to environmental pressures is called

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.

Match each example to one of the processes below. -A tourist carries seeds to a new location. These seeds are able to breed with plants of the same species in this new location.

A population of 8,250 mice occupies the sand dunes in a coastal area. A severe hurricane washes out several miles of sand dunes. As a result, only 50 mice remain. The population has experienced

Compare and contrast bottleneck and founder effect.

Genetic variation is based on

Which of the following is true with regard to mutations?

New alleles arise by

Gene flow occurs