Topic Test Answers

The events that lead to genetic drift are _______.a.always natural disastersb.randomc.predictabled.related to human activities

Which of the following statements about exponential growth curves is true?a.Exponential growth curves are common for R-selected species.b.Exponential growth curves show fast growth rates followed by slow growth rates.c.No organisms in nature experience exponential growth rates.d.Exponential growth curves are S-shaped.

There are approximately 30,000,000 white-tailed deer in the United States, which covers 3,536,000 square miles. What is the population density, rounded to the nearest whole number, for the white-tailed deer?a.2 deer per square mileb.4 deer per square milec.6 deer per square miled.8 deer per square mile

Natural selection is an evolutionary mechanism by which _______.a.advantageous traits are eliminated in a populationb.advantageous traits become more common in a populationc.inherited traits pass consistently through generationsd.organisms choose which traits to look for in their offspring

Why was the reduction of the bison population to under 1,000 individuals a bottleneck event for the species?a.It drastically reduced the gene pool of the species.b.It reduced the territorial range available to the species.c.Foreign genes were introduced by crossbreeding with cattle.d.It reduced the prevalence of recessive traits.

Which of the following is not a reason that populations display a regular (evenly spaced) distribution? a. territorial behavior b. competition for water c. competition for sunlight d. social behavior Please select the best answer from the choices provided

The _______ is the total number of organisms that an ecosystem can support.a.tolerance rangeb.carrying capacityc.competitive exclusion principled.population

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?a.even b.randomc.clumpedd.density

Which of the following limiting factors would be directly affected by a drought?a.birth/death rateb.immigrationc.available niched.resource supply

Which method to determine population size is the least invasive?a.mark/recaptureb.direct observationc.samplingd.indirect observation

The native range of a species includes all areas in which it lives.

Directional selection can be distinguished from disruptive selection by _______.a.the elimination of extreme variations of traitsb.selection for two extreme variations of a traitc.the preservation of gene frequenciesd.selection for one extreme variation of a trait

Why do disruptive selection pressures tend to favor rapid evolutionary changes? a. They result in sudden gene frequency changes. b. They eliminate extreme genetic traits. c. They select for one variation of a genetic trait. d. They result in environmental adaptation. Please select the best answer from the choices provided

The introduction of a virus to control an invasive species is an example of _______.a.mechanical controlc.biological controlb.chemical controld.all of the above

If China has a population of 1,355,935,022 people and an area of 3,705,405 mi, what is the population density of China?a.77 people/mib.123 people/mic.0.00273 people/mid.366 people/mi

The mark and recapture method of determining population size is always more effective than the sampling method.

The rarest distribution pattern in nature is random.

Bottleneck events are always caused by the death of most of a species’ population.

Physical removal of an invasive species is an example of _______.a.mechanical controlc.biological controlb.chemical controld.all of the above

Which of the following is not a potential result of a bottleneck event? a. an increase in potential mates b. a decrease in genetic diversity c. an increase in inbreeding d. an increased chance of extinction Please select the best answer from the choices provided