Question 1

New alleles arise by

Accepted Answer

A) nonrandom mating. 
B) allele frequency. 
C) genetic drift. 
D) mutation. 
A) nonrandom mating. 
B) allele frequency. 
C) genetic drift. 
D) mutation.

Question 2

Scientists have hypothesized that the reason European men have darker skin color than European women is that more than 10,000 years ago, these men preferred to mate with lighter-skinned females. If this is true, skin color is an example of _____ in Europeans.

Accepted Answer

A) gene flow 
B) a genetic bottleneck 
C) sexual selection 
D) recombination 
A) gene flow 
B) a genetic bottleneck 
C) sexual selection 
D) recombination

Question 3

Two-way gene flow increases the differences between two populations of the same species.

Accepted Answer

A) True 
 B)False

Question 4

A gene has two alleles, B and B. If the b allele becomes "fixed" in the population, its frequency will be

Accepted Answer

A) 0. 
B) 0.33. 
C) 0.5. 
D) 1. 
A) 0. 
B) 0.33. 
C) 0.5. 
D) 1.

Question 5

The occurrence of mutation is directed toward a specific goal.

Accepted Answer

A) True 
 B)False

Question 6

A population has a total of two alleles, G and g, for a given gene. Which one of the following sets of genotype frequencies is possible for that population?

Accepted Answer

A) GG = .25, Gg = .75, and gg = .35 
B) GG = .70, Gg = .25, and gg = .30 
C) GG = .75, Gg = .15, and gg = .10 
D) GG = .45, Gg = .15, and gg = .75 
A) GG = .25, Gg = .75, and gg = .35 
B) GG = .70, Gg = .25, and gg = .30 
C) GG = .75, Gg = .15, and gg = .10 
D) GG = .45, Gg = .15, and gg = .75

Question 7

Mutations generally cause rapid changes in allele frequencies in populations.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is an example of gene flow?

Accepted Answer

A) Pollen from a population A plant lands on the same plant (mating with itself). 
B) Pollen from a population A plant lands on another population A plant. 
C) Pollen from a population A plant lands on a population B plant. 
D) Pollen from a population B plant lands on a population B plant. 
A) Pollen from a population A plant lands on the same plant (mating with itself). 
B) Pollen from a population A plant lands on another population A plant. 
C) Pollen from a population A plant lands on a population B plant. 
D) Pollen from a population B plant lands on a population B plant.

Question 9

Gene flow occurs

Accepted Answer

A) as a result of genetic drift. 
B) if gametes, rather than individuals, move among populations. 
C) as a result of mutations in one population but not in another. 
D) when individuals within a population interbreed. 
A) as a result of genetic drift. 
B) if gametes, rather than individuals, move among populations. 
C) as a result of mutations in one population but not in another. 
D) when individuals within a population interbreed.

Question 10

Which of the following is a valid interpretation of this data regarding prairie chicken populations in several states in the Midwest?

Accepted Answer

A) Prairie chicken populations in Illinois have a lower mutation rate than those in the other listed states. 
B) Illinois prairie chickens lost genes from their genome as a result of a population crash. 
C) Smaller populations of prairie chickens have greater reproductive success. 
D) Larger populations of prairie chickens tend to have greater genetic diversity in their gene pools. 
A) Prairie chicken populations in Illinois have a lower mutation rate than those in the other listed states. 
B) Illinois prairie chickens lost genes from their genome as a result of a population crash. 
C) Smaller populations of prairie chickens have greater reproductive success. 
D) Larger populations of prairie chickens tend to have greater genetic diversity in their gene pools.

Question 11

The frequency of the genotype AA in a population is 0.36. What is the frequency of Aa?

Accepted Answer

A) 0.40 
B) 0.48 
C) 0.64 
D) This cannot be determined with the information provided. 
A) 0.40 
B) 0.48 
C) 0.64 
D) This cannot be determined with the information provided.

Question 12

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

Accepted Answer

A) genetic drift. 
B) mutation. 
C) natural selection. 
D) gene flow. 
A) genetic drift. 
B) mutation. 
C) natural selection. 
D) gene flow.

Question 13

If a given population has 30 RR individuals, 10 Rr individuals, and 10 rr individuals, what is the allele frequency of R?

Accepted Answer

A) 0.10 
B) 0.30 
C) 0.50 
D) 0.70 
A) 0.10 
B) 0.30 
C) 0.50 
D) 0.70

Question 14

Feeding healthy livestock antibiotics makes it more likely that antibiotic-resistant bacteria will evolve.

Accepted Answer

A) True 
 B)False

Question 15

____________________ promote rapid evolution by giving bacteria with resistance genes a selective advantage.

Accepted Answer

The answer of ____________________ promote rapid evolution by giving bacteria...

Question 16

Natural selection is a random process.

Accepted Answer

A) True 
 B)False

Question 17

The allele frequency of a recessive allele is always less than the allele frequency of a dominant allele.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following is not likely to be a cause of rapid evolution in a population?

Accepted Answer

A) a changing environment 
B) an organism that exhibits a rapid rate of mutation 
C) an organism that reproduces very slowly 
D) the immigration of individuals carrying a new allele that significantly increases reproductive success 
A) a changing environment 
B) an organism that exhibits a rapid rate of mutation 
C) an organism that reproduces very slowly 
D) the immigration of individuals carrying a new allele that significantly increases reproductive success

Question 19

The color of a certain species of beetle is determined by a single gene. Two beetles homozygous for green coloration produce a single offspring with brown coloration. Brown color appeared in this offspring as a result of a ____________________.

Accepted Answer

The answer of The color of a certain species of...

Question 20

A water plant gets wrapped around the propeller of a boat in Round Pond. This particular plant exhibits an unusual allele that gives it extra branches. The boat owner moves his boat to Big Lake without cleaning the plant off the propeller. The same species of water plant already exists in Big Lake, but none of the plants exhibit the "extra branches" allele. One year later, the frequency of the extra branches allele in Big Lake is much higher. This is an example of

Accepted Answer

A) genetic drift. 
B) mutation. 
C) natural selection. 
D) gene flow. 
A) genetic drift. 
B) mutation. 
C) natural selection. 
D) gene flow.

Exam 18: Evolution of Populations

New alleles arise by

Scientists have hypothesized that the reason European men have darker skin color than European women is that more than 10,000 years ago, these men preferred to mate with lighter-skinned females. If this is true, skin color is an example of _____ in Europeans.

Two-way gene flow increases the differences between two populations of the same species.

A gene has two alleles, B and B. If the b allele becomes "fixed" in the population, its frequency will be

The occurrence of mutation is directed toward a specific goal.

A population has a total of two alleles, G and g, for a given gene. Which one of the following sets of genotype frequencies is possible for that population?

Mutations generally cause rapid changes in allele frequencies in populations.

Which of the following is an example of gene flow?

Gene flow occurs

Which of the following is a valid interpretation of this data regarding prairie chicken populations in several states in the Midwest?

The frequency of the genotype AA in a population is 0.36. What is the frequency of Aa?

Several related bird species live in a desert. One species is much smaller than the other species. This species nests in holes in cacti. Because the bird is so small, it can easily squeeze between the spines of the cactus and create a well-protected nest. This is an example of

If a given population has 30 RR individuals, 10 Rr individuals, and 10 rr individuals, what is the allele frequency of R?

Feeding healthy livestock antibiotics makes it more likely that antibiotic-resistant bacteria will evolve.

____________________ promote rapid evolution by giving bacteria with resistance genes a selective advantage.

Natural selection is a random process.

The allele frequency of a recessive allele is always less than the allele frequency of a dominant allele.

Which of the following is not likely to be a cause of rapid evolution in a population?

The color of a certain species of beetle is determined by a single gene. Two beetles homozygous for green coloration produce a single offspring with brown coloration. Brown color appeared in this offspring as a result of a ____________________.

The Nature of Science and the Characteristics of Life

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Stem Cells, Cancer, and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

Dna and Genes

From Gene to Protein

Dna Technology

How Evolution Works

Speciation and the Origins of Biological Diversity

The Evolutionary History of Life

The Biosphere

Growth of Populations

Ecological Communities

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons, Muscles, and Movement

Defenses Against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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