Question 1

Nonrandom mating (for example, assortative mating) directly affects gene frequencies in populations.

Accepted Answer

A) True 
 B)False

Question 2

Elephants have a matriarchal society, and young males are driven out of the herd when they reach adulthood. From an evolutionary standpoint, what does this accomplish?

Accepted Answer

A)  natural selection 
B)  formation of a more variable population 
C)  gene flow 
D)  nonrandom mating 
A)  natural selection 
B)  formation of a more variable population 
C)  gene flow 
D)  nonrandom mating

Question 3

Match the following description with the term.
-A small number of individuals from one area establish a new isolated population in another area. The gene frequencies of the new population differ from those of the original population.

Accepted Answer

A)  founder effect 
B)  gene flow 
C)  genetic drift 
D)  stabilizing selection 
E)  sexual selection 
A)  founder effect 
B)  gene flow 
C)  genetic drift 
D)  stabilizing selection 
E)  sexual selection

Question 4

Match the following description with the term.
-Females tend to mate with brightly colored males.

Accepted Answer

A)  founder effect 
B)  gene flow 
C)  genetic drift 
D)  stabilizing selection 
E)  sexual selection 
A)  founder effect 
B)  gene flow 
C)  genetic drift 
D)  stabilizing selection 
E)  sexual selection

Question 5

Why do most human societies have laws or customs against marrying close relatives?

Accepted Answer

Marriage to close relatives re

Question 6

Suppose we find a population with 60 AA individuals, 20 Aa individuals, and 20 aa individuals, what is the allele frequency of A?

Accepted Answer

A)  0.20 
B)  0.40 
C)  0.60 
D)  0.70 
A)  0.20 
B)  0.40 
C)  0.60 
D)  0.70

Question 7

Which of the following would decrease genetic variation in a population?

Accepted Answer

A)  mutation 
B)  genetic drift 
C)  gene flow 
D)  migration 
A)  mutation 
B)  genetic drift 
C)  gene flow 
D)  migration

Question 8

Read the statement below and then answer the questions that follow. A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers.
-As the years go by, the environment on this island shows no significant evidence of change. If the deer herd reaches a stable population size, what kind of evolutionary force is likely to be acting on the population?

Accepted Answer

A)  directional selection 
B)  disruptive selection 
C)  founder effect 
D)  stabilizing selection 
A)  directional selection 
B)  disruptive selection 
C)  founder effect 
D)  stabilizing selection

Question 9

Refer to the following populations of a plant species and then answer the questions that follow.
1. 20 plants capable of asexual reproduction only.
2. 50 plants with unisexual flowers. Some plants bear male and some female flowers.
3. 1,000 plants with bisexual, self-fertilizing flowers.
4. 500 plants with bisexual, self-sterile flowers that make seeds only when cross-pollinated.
-Which population would probably show the most variation?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 10

Which phrase best defines gene pool?

Accepted Answer

A)  all the alleles at one locus in a population 
B)  all the loci on one set of chromosomes in a population 
C)  a group of genes that drift and flow 
D)  all the alleles at all loci of all individuals of a population 
A)  all the alleles at one locus in a population 
B)  all the loci on one set of chromosomes in a population 
C)  a group of genes that drift and flow 
D)  all the alleles at all loci of all individuals of a population

Question 11

The previously described state of the sickle-cell gene in African Americans since malaria was eliminated in the United States is an example of:

Accepted Answer

A)  genetic drift. 
B)  disruptive selection. 
C)  the founder effect. 
D)  directional selection. 
A)  genetic drift. 
B)  disruptive selection. 
C)  the founder effect. 
D)  directional selection.

Question 12

A group of similar organisms that can successfully interbreed:

Accepted Answer

A)  shares the same genotype. 
B)  shares the same phenotype. 
C)  is referred to as a species. 
D)  is very difficult to find in nature. 
A)  shares the same genotype. 
B)  shares the same phenotype. 
C)  is referred to as a species. 
D)  is very difficult to find in nature.

Question 13

What do you think will happen in a population of frogs in which no mutations occur, no migrations happen, the adults mate randomly, and each frog has the same chance of reproducing?

Accepted Answer

A)  A bottleneck will occur. 
B)  The frogs will become extinct. 
C)  Evolution will occur at the normal rate. 
D)  No evolution will occur. 
A)  A bottleneck will occur. 
B)  The frogs will become extinct. 
C)  Evolution will occur at the normal rate. 
D)  No evolution will occur.

Question 14

Populations of sexually reproducing organisms are continually evolving by which means?

Accepted Answer

A)  They are getting bigger. 
B)  They are changing. 
C)  They are at equilibrium. 
D)  They are improving. 
A)  They are getting bigger. 
B)  They are changing. 
C)  They are at equilibrium. 
D)  They are improving.

Question 15

How efficient is sexual reproduction alone in gauging the frequency of an allele?

Accepted Answer

A)  very efficient 
B)  barely efficient 
C)  not efficient at all 
A)  very efficient 
B)  barely efficient 
C)  not efficient at all

Question 16

Refer to the table above and then answer the questions that follow.
-Sexual displays and contests common in the Kingdom Animalia (such as bighorn sheep bashing their heads together) result in:

Accepted Answer

A)  mutations. 
B)  nonrandom mating. 
C)  random mating. 
D)  stabilizing selection. 
A)  mutations. 
B)  nonrandom mating. 
C)  random mating. 
D)  stabilizing selection.

Question 17

Which of the following traits probably arose through sexual selection?

Accepted Answer

A)  speed in cheetahs 
B)  camouflage in walking stick insects 
C)  brighter plumage in male birds than in female birds of the same species 
D)  migration in whales 
A)  speed in cheetahs 
B)  camouflage in walking stick insects 
C)  brighter plumage in male birds than in female birds of the same species 
D)  migration in whales

Question 18

Refer to the following populations of a plant species and then answer the questions that follow.
1. 20 plants capable of asexual reproduction only.
2. 50 plants with unisexual flowers. Some plants bear male and some female flowers.
3. 1,000 plants with bisexual, self-fertilizing flowers.
4. 500 plants with bisexual, self-sterile flowers that make seeds only when cross-pollinated.
-Which population is most likely to change as a result of genetic drift?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 19

Which of the following is not a source of variation within a species or population?

Accepted Answer

A)  meiosis 
B)  natural selection 
C)  mutation 
D)  sexual reproduction 
A)  meiosis 
B)  natural selection 
C)  mutation 
D)  sexual reproduction

Question 20

What is the difference between microevolution and macroevolution?

Accepted Answer

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)  It is a convenient, arbitrary distinction based on whether shorter or longer time periods of evolution are being considered. 
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)  It is a convenient, arbitrary distinction based on whether shorter or longer time periods of evolution are being considered.

Exam 17: Microevolution

Nonrandom mating (for example, assortative mating) directly affects gene frequencies in populations.

Elephants have a matriarchal society, and young males are driven out of the herd when they reach adulthood. From an evolutionary standpoint, what does this accomplish?

Match the following description with the term. -A small number of individuals from one area establish a new isolated population in another area. The gene frequencies of the new population differ from those of the original population.

Match the following description with the term. -Females tend to mate with brightly colored males.

Why do most human societies have laws or customs against marrying close relatives?

Suppose we find a population with 60 AA individuals, 20 Aa individuals, and 20 aa individuals, what is the allele frequency of A?

Which of the following would decrease genetic variation in a population?

Which phrase best defines gene pool?

The previously described state of the sickle-cell gene in African Americans since malaria was eliminated in the United States is an example of:

A group of similar organisms that can successfully interbreed:

What do you think will happen in a population of frogs in which no mutations occur, no migrations happen, the adults mate randomly, and each frog has the same chance of reproducing?

Populations of sexually reproducing organisms are continually evolving by which means?

How efficient is sexual reproduction alone in gauging the frequency of an allele?

Refer to the table above and then answer the questions that follow. -Sexual displays and contests common in the Kingdom Animalia (such as bighorn sheep bashing their heads together) result in:

Which of the following traits probably arose through sexual selection?

Which of the following is not a source of variation within a species or population?

What is the difference between microevolution and macroevolution?

A Guide to the Natural World

Chemistry, Water and PH

Lifes Components: Biological Molecules

Lifes Home: The Cell

Lifes Border: The Plasma Membrane

An Introduction to Energy

Deriving Energy From Food

Photosynthesis

Genetics and Cell Division

Preparing for Sexual Reproduction: Meiosis

Mendel and His Discoveries

Chromosomes and Inheritance

Dna Structure and Replication

Transcription Translation and Regulation

Biotechnology

Charles Darwin, Evolutionary Thought, and the Evidence for Evolution

Macroevolution

The History of Life on Earth

The Evolution of Human Beings

The Diversity of Life 1

The Diversity of Life 2

The Diversity of Life 3

An Introduction to Flowering Plants

Form and Function in Flowering Plants

The Integumentary Skeletal and Muscular Systems

The Nervous and Endocrine System

The Immune System

Blood and Breath

Digestion, Nutrition and Elimination

Animal Development

Human Reproduction

Populations in Ecology

Communities in Ecology

Ecosystems and Biomes

Animal Behavior

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