Question 1

Which of the following does NOT promote speciation?

Accepted Answer

A) gamete differences 
B) gene flow 
C) season of fertility 
D) natural selection 
E) genetic drift 
A) gamete differences 
B) gene flow 
C) season of fertility 
D) natural selection 
E) genetic drift

Question 2

"Seasonal," "daily," and "monthly" all describe what type of reproductive isolating mechanism?

Accepted Answer

A) behavioral 
B) temporal 
C) mechanical 
D) gamete 
E) ecological 
A) behavioral 
B) temporal 
C) mechanical 
D) gamete 
E) ecological

Question 3

Polyploid species are least common in

Accepted Answer

A) flowering plants. 
B) mollusks. 
C) insects. 
D) conifers. 
E) mammals. 
A) flowering plants. 
B) mollusks. 
C) insects. 
D) conifers. 
E) mammals.

Question 4

Mules are unusual hybrids because they

Accepted Answer

A) are weak. 
B) have a low survival rate. 
C) are robust. 
D) are sterile. 
E) produce sterile offspring. 
A) are weak. 
B) have a low survival rate. 
C) are robust. 
D) are sterile. 
E) produce sterile offspring.

Question 5

Mules are __________ and are subject to __________.

Accepted Answer

A) all males; postzygotic reproductive isolation 
B) all females; postzygotic reproductive isolation 
C) all females; prezygotic reproductive isolation 
D) hybrids; postzygotic reproductive isolation 
E) hybrids; prezygotic reproductive isolation 
A) all males; postzygotic reproductive isolation 
B) all females; postzygotic reproductive isolation 
C) all females; prezygotic reproductive isolation 
D) hybrids; postzygotic reproductive isolation 
E) hybrids; prezygotic reproductive isolation

Question 6

Allopatric speciation requires

Accepted Answer

A) accelerated gene flow. 
B) physical separation. 
C) physical diversity. 
D) behavioral diversity. 
E) all of these. 
A) accelerated gene flow. 
B) physical separation. 
C) physical diversity. 
D) behavioral diversity. 
E) all of these.

Question 7

Rats

Accepted Answer

A) are carriers of human pathogens. 
B) spread bubonic plague via infected fleas. 
C) infest rice fields, significantly reducing the yield. 
D) cause billions of dollars of annual economic loss. 
E) do all of these. 
A) are carriers of human pathogens. 
B) spread bubonic plague via infected fleas. 
C) infest rice fields, significantly reducing the yield. 
D) cause billions of dollars of annual economic loss. 
E) do all of these.

Question 8

Which is NOT true about gene mutations?

Accepted Answer

A) All are transmitted to the next generation. 
B) They are rare but their rates can be predicted. 
C) Those with beneficial effects will be favored by natural selection. 
D) Many reduce an individual's chance of surviving and reproducing. 
E) Those with neutral effects neither help nor hurt the individual. 
A) All are transmitted to the next generation. 
B) They are rare but their rates can be predicted. 
C) Those with beneficial effects will be favored by natural selection. 
D) Many reduce an individual's chance of surviving and reproducing. 
E) Those with neutral effects neither help nor hurt the individual.

Question 9

Which of the statements below is true about warfarin?

Accepted Answer

A) It is a very effective rodenticide. 
B) It interferes with blood clotting in rats. 
C) Rats that are resistant to warfarin possess a gene that is rare among vulnerable rats. 
D) It is an agent of natural selection in rats. 
E) All of these are true. 
A) It is a very effective rodenticide. 
B) It interferes with blood clotting in rats. 
C) Rats that are resistant to warfarin possess a gene that is rare among vulnerable rats. 
D) It is an agent of natural selection in rats. 
E) All of these are true.

Question 10

In stabilizing selection

Accepted Answer

A) differential survival and reproduction favor the extremes of the population. 
B) humans are the chief factor controlling which organisms survive and reproduce. 
C) the intermediate type of organisms survive and reproduce. 
D) the characteristics of a population move in one direction or another through time. 
E) variability is encouraged in a population, and unusual forms are more common. 
A) differential survival and reproduction favor the extremes of the population. 
B) humans are the chief factor controlling which organisms survive and reproduce. 
C) the intermediate type of organisms survive and reproduce. 
D) the characteristics of a population move in one direction or another through time. 
E) variability is encouraged in a population, and unusual forms are more common.

Question 11

Genetic equilibrium and allele frequencies are maintained by all EXCEPT which one of the following?

Accepted Answer

A) lack of gene flow. 
B) large population interbreeding freely 
C) differential survival and reproduction 
D) random mating 
E) absence of mutations 
A) lack of gene flow. 
B) large population interbreeding freely 
C) differential survival and reproduction 
D) random mating 
E) absence of mutations

Question 12

Divergence may lead to

Accepted Answer

A) genetic drift. 
B) speciation. 
C) genetic equilibrium. 
D) gene flow. 
E) all of these. 
A) genetic drift. 
B) speciation. 
C) genetic equilibrium. 
D) gene flow. 
E) all of these.

Question 13

Which of the following can result in speciation within a few generations?

Accepted Answer

A) development of a physical barrier 
B)  polyploidy 
C) postzygotic isolating mechanisms 
D) change in environmental conditions 
E) the introduction of a new predator into an area 
A) development of a physical barrier 
B)  polyploidy 
C) postzygotic isolating mechanisms 
D) change in environmental conditions 
E) the introduction of a new predator into an area

Question 14

Of the following, which does NOT characterize a population in genetic equilibrium?

Accepted Answer

A) large population size 
B) no mutation 
C) differential reproduction 
D) absence of gene flow 
E) random mating 
A) large population size 
B) no mutation 
C) differential reproduction 
D) absence of gene flow 
E) random mating

Question 15

The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of

Accepted Answer

A) natural selection. 
B) genetic isolation. 
C) the bottleneck effect. 
D) the founder effect.. 
E) all of these. 
A) natural selection. 
B) genetic isolation. 
C) the bottleneck effect. 
D) the founder effect.. 
E) all of these.

Question 16

Evidence from the flour beetle experiments discussed in the text provides support for genetic drift resulting in

Accepted Answer

A) random change in allele frequencies. 
B) fixation of one or more alleles. 
C) loss of genetic diversity. 
D) greater change in allele frequencies in smaller populations. 
E) all of these. 
A) random change in allele frequencies. 
B) fixation of one or more alleles. 
C) loss of genetic diversity. 
D) greater change in allele frequencies in smaller populations. 
E) all of these.

Question 17

If you sampled the genetic characteristics of a large population and found that of the 50 loci analyzed there is very little, if any, variation, the most likely explanation is that

Accepted Answer

A) a uniform environment selected for these alleles. 
B) there has been a lack of migration, and the genetic equilibrium stabilized the population. 
C) strong selection pressures eliminated alternative alleles. 
D) a bottleneck effect may have occurred in the past to reduce the variability in the population. 
E) a combination of low mutation rates and differential sexual selection produced these results. 
A) a uniform environment selected for these alleles. 
B) there has been a lack of migration, and the genetic equilibrium stabilized the population. 
C) strong selection pressures eliminated alternative alleles. 
D) a bottleneck effect may have occurred in the past to reduce the variability in the population. 
E) a combination of low mutation rates and differential sexual selection produced these results.

Question 18

In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygous genotype is 0.49.The percentage of the population that is heterozygous is

Accepted Answer

A) 51. 
B) 49. 
C) 42. 
D) 7. 
E) 3. 
A) 51. 
B) 49. 
C) 42. 
D) 7. 
E) 3.

Question 19

The best control for rats is

Accepted Answer

A) a very effective rodenticide. 
B) removal of garbage which causes them to eat each other. 
C) cats introduced into the food storage buildings. 
D) new sonic disturbance boxes. 
E) none of these. 
A) a very effective rodenticide. 
B) removal of garbage which causes them to eat each other. 
C) cats introduced into the food storage buildings. 
D) new sonic disturbance boxes. 
E) none of these.

Question 20

Sympatric speciation through polyploidy is a frequent phenomenon in

Accepted Answer

A) insects. 
B) mammals. 
C) bacteria. 
D) plants. 
E) protists. 
A) insects. 
B) mammals. 
C) bacteria. 
D) plants. 
E) protists.

Exam 18: Emergence of Evolutionary Thought

Which of the following does NOT promote speciation?

"Seasonal," "daily," and "monthly" all describe what type of reproductive isolating mechanism?

Polyploid species are least common in

Mules are unusual hybrids because they

Mules are __________ and are subject to __________.

Allopatric speciation requires

Rats

Which is NOT true about gene mutations?

Which of the statements below is true about warfarin?

In stabilizing selection

Genetic equilibrium and allele frequencies are maintained by all EXCEPT which one of the following?

Divergence may lead to

Which of the following can result in speciation within a few generations?

Of the following, which does NOT characterize a population in genetic equilibrium?

The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of

Evidence from the flour beetle experiments discussed in the text provides support for genetic drift resulting in

If you sampled the genetic characteristics of a large population and found that of the 50 loci analyzed there is very little, if any, variation, the most likely explanation is that

In a population that is in Hardy-Weinberg equilibrium, the frequency of the recessive homozygous genotype is 0.49.The percentage of the population that is heterozygous is

The best control for rats is

Sympatric speciation through polyploidy is a frequent phenomenon in

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters

Mules are and are subject to .