1) Organisms that can interbreed with each other in nature but are genetically isolated from all other organisms are a:

A) genus.

B) clone.

C) species.

D) family.

2) Which of the following statements about evolution is true?

A) Evolution involves maintaining a constant frequency of alleles in the gene pool.

B) Populations evolve.

C) Individuals evolve.

D) Evolution can proceed to a limited extent without the occurrence of mutation.

3) A population is:

A) a group of organisms that can successfully interbreed in nature but do not interbreed with other such groups.

B) all the members of a species that live in a defined geographic region at the same time.

C) all the different species that live in a defined geographic area at the same time.

D) a group of different species that share common features.

4) The gene pool for a particular gene would include:

A) the sum of all the alleles for all the traits in the population.

B) all the alleles for a given trait in a particular individual organism of the population.

C) the sum of all the phenotypes in the population.

D) all the alleles for a particular gene in all the individuals in the population.

5) The genetic makeup of any organism is its ________, which determines the physical characteristics called its ________.

A) genotype; alleles

B) gene pool; alleles

C) phenotype; genotype

D) genotype; phenotype

6) If every sexually reproducing organism has only two alleles for each gene, how can there be a range of traits seen for a physical characteristic?

A) One of the alleles in an organism is expressed at different levels, while the other is turned off.

B) Sometimes one of the alleles works, and other times the other allele works.

C) There can be more than two variations of a gene in a population.

D) In a population there are only two variations of a gene, but they are blended differently during sexual reproduction.

7) At its most basic level, evolution is a:

A) change in the frequency of alleles in a population.

B) change in the frequency of alleles in an individual.

C) new species arising from an existing species.

D) change in an individual’s phenotype caused by mutations.

8) What is the difference between microevolution and macroevolution?

A) Microevolution is hypothetical because changes are too small to be observed, whereas macroevolution is detectable.

B) Microevolution deals with microscopic organisms, whereas macroevolution deals with larger ones.

C) Microevolution describes what happens in small populations, whereas macroevolution deals with large populations.

D) Microevolution describes changes within a population over a short period of time, whereas macroevolution describes larger changes such as the formation of new species over longer periods of time.

9) The formation of new species over many generations is an example of:

A) microevolution.

B) macroevolution.

C) gene pools.

D) allelic variants.

10) If within a large population no mutations occur, no migration occurs, all mating is random, and each individual has an equal chance of reproducing, which of the following will probably happen?

A) No evolution will occur.

B) A bottleneck will occur.

C) A change in allele frequency will lead to rapid evolution.

D) Extinction will occur.