Ch. 21

The appropriate unit for defining and measuring genetic variation is the:

Which of the following populations is most likely to be close to Hardy-Weinberg equilibrium?

Gene flow means most nearly the same as:

Which of the following statements about the relationship between humans and evolution is FALSE?

The Hardy-Weinberg model predicts how _________ are transferred from one generation to the next.

Which of the following is NOT a reason cited for why adaptive radiations are more common on island archipelagos than on continents?

The phenotype of an organism is:

The Hardy-Weinberg equilibrium is a null hypothesis that assumes all of the following forces are absent EXCEPT:

While on the voyage of the HMS Beagle, Darwin:

Natural selection decreases genetic variability in a population. This statement is:

All of the following must be true of theoretical populations in Hardy-Weinberg equilibrium EXCEPT:

What is the difference between artificial selection and natural selection?

In a population in Hardy-Weinberg Equilibrium:

In a population at Hardy-Weinberg equilibrium in which the frequency of A alleles (p) is 0.4, the expected frequency of Aa individuals is:

A population is said to be polymorphic for a gene locus if it has at least:

The correct equation illustrating the Hardy-Weinberg principle is:

Genetic variation is maintained in populations through all of the following processes EXCEPT:

A bimodal distribution in a trait is most likely to be caused by _____ selection.

A breeder of thoroughbreds selects only the fastest horses for breeding stock. This is an example of artificial ____________ selection.

Which biologist first described evolution as "descent with modification?"

If evolution has occurred:

The average time to death from starvation in a fruit fly is about 20 hours. Selecting for increased starvation resistance in fruit flies:

Which of the following is a statement that describes the concept of convergent evolution?

Most copies of rare recessive alleles in a sexual species are carried by individuals that are:

Georges Cuvier’s discovery of fossils of Irish elk and giant ground sloths:

Why is it that creationism can never be accepted as a scientific explanation of the origin of life?

To demonstrate evolution by natural selection, all of the following conditions must be satisfied EXCEPT:

In genetics, the coexistence in the same population of two distinct hereditary types based on different alleles is also referred to as:

When a group of individuals colonizes a new habitat, the event is likely to be an evolutionary event because:

In the 1790s, Georges Cuvier found the fossil remains of mastodons. This conflicted with the prevailing world view in Europe because:

_____ selection favors organisms that have character values at both extremes of the phenotypic distribution.

In the equation illustrating Hardy-Weinberg equilibrium, q² represents:

In a population at Hardy-Weinberg equilibrium in which the frequency of A alleles (p) is 0.3, the expected frequency of Aa individuals is

For a population to evolve, its members must

Which statement about variation is most correct?

Frequency-dependent selection will often

Darwin used the term "natural selection" because he was familiar with artificial selection in which group of organisms?

Genetic drift will have the greatest effects for populations:

Thomas Malthus's 1798 work, "Essay on the Principle of Population," greatly influenced Darwin. Which statement best summarizes Malthus's idea?

Natural selection means most nearly the same as:

Under the right conditions, which type of selection is most likely to lead to the formation of new species?

All of the following occur during a population bottleneck EXCEPT:

Disruptive selection occurs when:

When traits are under ________ control, the resulting phenotypes are normally distributed. These non-discrete traits are ___________ characters.

Charles Darwin spent time on the Beagle:

Tiktaalik appears to:

__________, or hybrid vigor, refers to the superiority of one or more characteristics of crossbred organisms, compared with inbred organisms.

Which of the study organisms below is NOT properly paired with the evolutionary mechanism that it was used as an example of?

All of the following are types of natural selection EXCEPT:

Errors sometimes occur when DNA duplicates itself. Why might that be a good thing?

Which statement is NOT true of the phenotype of an organism?

Inbreeding:

Anatomical homology in vertebrate forelimbs is considered to be evidence for evolution because:

Extensive inbreeding usually results in increased _________ and decreased ________ in a population.

Which of the following statements about mutations is FALSE?

Select from the choices below the statement that best describes the effect of the migration of individuals into a population.