Exam 16: How Populations Evolve

Bright coloration in birds makes them stand out to predators. In female birds that sit on the nest, bright coloration is rare. This is likely the result of

Evolution can be defined as change in in a population.

Which of the following is an example of assortative mating?

Which trait is the best example of an adaptation?

A young male baboon leaves the troop that he was born in and joins a small neighboring troop of small baboons. He quickly rises to become a dominant male. From an evolutionary point of view, what important process has occurred?

Imagine that two men and two women settle on an uninhabited island, no new settlers arrive, and nobody leaves the island for many generations. All four of the settlers have brown eyes, but one of the men carries a recessive gene for blue eyes. Eye color has no effect on fitness. If the percentage of blue- eyed individuals on the island increases from 0% to 25%, what is the probable cause?

How does the founder effect influence the frequency of alleles in a population?

In a certain species of salmon, some adult males are extremely large whereas other adult males are very small, compared to the females. There are no intermediate- sized adult males in the population. This is probably the result of

When a species lives in a constant environment for a long time, the "average type" of individual may have the best chance of surviving and producing the most offspring. What type of selection is occurring?

Which of the following phenomena favors individuals with average phenotypes over those with extreme phenotypes?

According to the Hardy- Weinberg principle, if 75% of the alleles in the gene pool are A1 and 25% are A2, what is the proportion of individuals with genotype A1A2 in this population?

Based on the information shown in the figure, what do you predict the fourth generation will look like?

The gene pool for a particular population is made up of

A bacterial allele that provides resistance to the antibiotic streptomycin is

Individuals who have one dominant allele and one recessive allele for a trait are referred to as .

The male peacock's beautiful tail is really a trade- off between

Despite causing a life- threatening disease, the sickle- cell allele in some areas of Africa has remained in high frequency in those populations because it protects against malaria. In the United States, malaria was eradicated shortly before World War II by eliminating the mosquito that spreads the disease. What is likely to happen to the frequency of the sickle- cell allele in African Americans living in the United States?

In the population shown in the figure, what is the most common fur color allele in this population?

Which of the following can be measured to estimate an organism's evolutionary fitness?

Evolution occurs in .