Question 1

Evolution that occurs as a result of chance events is called

Accepted Answer

A)  sexual selection. 
B)  genetic drift. 
C)  gene flow. 
D)  population bottleneck. 
A)  sexual selection. 
B)  genetic drift. 
C)  gene flow. 
D)  population bottleneck.

Question 2

A gene exists as two alleles in a population of freely mating individuals. If 40% of the population carries the recessive allele (a)for the gene, what percentage of the population has the homozygous recessive aa genotype?

Accepted Answer

A)  40% 
B)  20% 
C)  16% 
D)  80% 
A)  40% 
B)  20% 
C)  16% 
D)  80%

Question 3

Fruit flies all look more or less alike. If you have a male and female fruit fly, how could you test the hypothesis that they're the same species?

Accepted Answer

A)  Determine the sequence of several of their genes. 
B)  Examine them closely under a microscope, and compare what you see to a published description of fruit flies. 
C)  See if they'll mate when they're put together. 
D)  See if they mate and if their offspring can also mate. 
A)  Determine the sequence of several of their genes. 
B)  Examine them closely under a microscope, and compare what you see to a published description of fruit flies. 
C)  See if they'll mate when they're put together. 
D)  See if they mate and if their offspring can also mate.

Question 4

Populations that change due to genetic drift

Accepted Answer

A)  haven't really undergone evolutionary change. 
B)  will then be subject to strong sexual selection. 
C)  have evolved. 
D)  will soon change back to the original form as a result of natural selection. 
A)  haven't really undergone evolutionary change. 
B)  will then be subject to strong sexual selection. 
C)  have evolved. 
D)  will soon change back to the original form as a result of natural selection.

Question 5

Traits like reduced body hair in many native North American and Asian populations are most likely the result of sexual selection.

Accepted Answer

A) True 
 B)False

Question 6

Which of these most accurately describes a single population?

Accepted Answer

A)  all the oak trees in a park 
B)  two coneflower plants in a field of coneflowers 
C)  all the housecats in Montana 
D)  all the gulls in North America 
A)  all the oak trees in a park 
B)  two coneflower plants in a field of coneflowers 
C)  all the housecats in Montana 
D)  all the gulls in North America

Question 7

How are human fossils classified into species?

Accepted Answer

A)  by differences in DNA 
B)  by differences in diet 
C)  by differences in skin color 
D)  by differences in the skeleton 
A)  by differences in DNA 
B)  by differences in diet 
C)  by differences in skin color 
D)  by differences in the skeleton

Question 8

One species of plant produces flowers when nights are 10 hours long. A related species comes into flower when nights are 9 hours long. This is an example of

Accepted Answer

A)  gamete incompatibility. 
B)  temporal isolation. 
C)  mechanical isolation. 
D)  behavioral isolation. 
A)  gamete incompatibility. 
B)  temporal isolation. 
C)  mechanical isolation. 
D)  behavioral isolation.

Question 9

A genealogical species definition includes fewer organisms than a biological species definition.

Accepted Answer

A) True 
 B)False

Question 10

The eggs released by sponges during reproduction have proteins on their surfaces that prevent sperm from different sponge species from binding to the eggs. This is an example of

Accepted Answer

A)  gamete compatibility. 
B)  hybrid inviability. 
C)  mechanical reproductive isolation. 
D)  behavioral reproductive isolation. 
A)  gamete compatibility. 
B)  hybrid inviability. 
C)  mechanical reproductive isolation. 
D)  behavioral reproductive isolation.

Question 11

The terms "subspecies" and "race" are best described by which of the following scenarios?

Accepted Answer

A)  a population of rabbits that lives near a lake and sometimes breeds with rabbits farther inland 
B)  two populations of birds that have different amounts of orange coloration and could produce offspring if they were not separated by a mountain range 
C)  two populations of frogs that cannot produce offspring 
D)  a breed of dog with a longhaired coat instead of a shorthaired coat 
A)  a population of rabbits that lives near a lake and sometimes breeds with rabbits farther inland 
B)  two populations of birds that have different amounts of orange coloration and could produce offspring if they were not separated by a mountain range 
C)  two populations of frogs that cannot produce offspring 
D)  a breed of dog with a longhaired coat instead of a shorthaired coat

Question 12

-The figure shows that sickle cell allele is not common in every region that malaria is present. Why not?

Accepted Answer

A)  The sickle-cell allele only protects against some forms of malaria. 
B)  The sickle-cell allele is adaptive in only some races but not others. 
C)  The sickle-cell allele appeared by chance in certain populations and increased in frequency in those populations after it appeared. 
D)  The areas where sickle-cell and malaria overlap represent migration from the original population where sickle-cell arose. 
A)  The sickle-cell allele only protects against some forms of malaria. 
B)  The sickle-cell allele is adaptive in only some races but not others. 
C)  The sickle-cell allele appeared by chance in certain populations and increased in frequency in those populations after it appeared. 
D)  The areas where sickle-cell and malaria overlap represent migration from the original population where sickle-cell arose.

Question 13

Which of the following would be considered a population genetics question that could be answered using the Hardy-Weinberg equation?

Accepted Answer

A)  What will be the frequency of a particular genotype in a future generation? 
B)  What is the probability that members of two groups will mate? 
C)  Is an allele dominant or recessive? 
D)  What is the genetic basis of racial categories? 
A)  What will be the frequency of a particular genotype in a future generation? 
B)  What is the probability that members of two groups will mate? 
C)  Is an allele dominant or recessive? 
D)  What is the genetic basis of racial categories?

Question 14

In order to support the hypothesis that two groups are different races, one group should have at least some unique alleles

Accepted Answer

A)  in one individual in the population. 
B)  in one family line of the population. 
C)  in a significant number of members in the population. 
D)  in all the members on the population. 
A)  in one individual in the population. 
B)  in one family line of the population. 
C)  in a significant number of members in the population. 
D)  in all the members on the population.

Question 15

Reproductive isolation is the only requirement for speciation.

Accepted Answer

A) True 
 B)False

Question 16

All of the bees in an area are eliminated by disease. This could lead to reproductive isolation of which of the following species in the area?

Accepted Answer

A)  black cherry trees 
B)  red ants 
C)  white-footed mice 
D)  ostrich ferns 
A)  black cherry trees 
B)  red ants 
C)  white-footed mice 
D)  ostrich ferns

Question 17

-How does the distribution shown on the map of alleles for the B blood type support the hypothesis that there are no biological races of humans?

Accepted Answer

A)  All human groups show the same frequency of this allele. 
B)  A distinct frequency pattern of this allele is found in each human group. 
C)  A gradient of frequency of the allele is found from its origin in Asia outward to Europe. 
D)  There's no pattern with respect to frequency of this allele throughout Asia and Europe. 
A)  All human groups show the same frequency of this allele. 
B)  A distinct frequency pattern of this allele is found in each human group. 
C)  A gradient of frequency of the allele is found from its origin in Asia outward to Europe. 
D)  There's no pattern with respect to frequency of this allele throughout Asia and Europe.

Question 18

Assortative matings have what effect on populations?

Accepted Answer

A)  They cause one sex to be much different than the other. 
B)  They cause isolated groups to be more similar to each other. 
C)  They increase the rate of mutations. 
D)  They maintain appearance differences between groups. 
A)  They cause one sex to be much different than the other. 
B)  They cause isolated groups to be more similar to each other. 
C)  They increase the rate of mutations. 
D)  They maintain appearance differences between groups.

Question 19

Which of the following occurs after the creation of a new allele?

Accepted Answer

A)  The gene pool becomes more diverse. 
B)  The gene pool becomes less diverse. 
C)  The gene pool fragments into smaller groups. 
D)  Reproductive isolation always occurs in the group where the mutation occurred. 
A)  The gene pool becomes more diverse. 
B)  The gene pool becomes less diverse. 
C)  The gene pool fragments into smaller groups. 
D)  Reproductive isolation always occurs in the group where the mutation occurred.

Question 20

When a founder population has a small gene pool, evolutionary change is more likely to be rapid than if the founder population has a large gene pool.

Accepted Answer

A) True 
 B)False

Exam 12: Who Am I? Species and Races

Evolution that occurs as a result of chance events is called

A gene exists as two alleles in a population of freely mating individuals. If 40% of the population carries the recessive allele (a)for the gene, what percentage of the population has the homozygous recessive aa genotype?

Fruit flies all look more or less alike. If you have a male and female fruit fly, how could you test the hypothesis that they're the same species?

Populations that change due to genetic drift

Traits like reduced body hair in many native North American and Asian populations are most likely the result of sexual selection.

Which of these most accurately describes a single population?

How are human fossils classified into species?

One species of plant produces flowers when nights are 10 hours long. A related species comes into flower when nights are 9 hours long. This is an example of

A genealogical species definition includes fewer organisms than a biological species definition.

The eggs released by sponges during reproduction have proteins on their surfaces that prevent sperm from different sponge species from binding to the eggs. This is an example of

The terms "subspecies" and "race" are best described by which of the following scenarios?

-The figure shows that sickle cell allele is not common in every region that malaria is present. Why not?

Which of the following would be considered a population genetics question that could be answered using the Hardy-Weinberg equation?

In order to support the hypothesis that two groups are different races, one group should have at least some unique alleles

Reproductive isolation is the only requirement for speciation.

All of the bees in an area are eliminated by disease. This could lead to reproductive isolation of which of the following species in the area?

-How does the distribution shown on the map of alleles for the B blood type support the hypothesis that there are no biological races of humans?

Assortative matings have what effect on populations?

Which of the following occurs after the creation of a new allele?

When a founder population has a small gene pool, evolutionary change is more likely to be rapid than if the founder population has a large gene pool.

Can Science Cure the Common Cold? Introduction to the Scientific Method

Are We Alone in the Universe? Water, Biochemistry, and Cells

Is It Possible to Supplement Your Way to Better Health?

Fat: How Much is Right for You? Enzymes, Metabolism, and Cellular Respiration

Life in the Greenhouse: Photosynthesis and Global Warming

Cancer: DNA Synthesis, Mitosis, and Meiosis

Are You Only as Smart as Your Genes? Mendelian and Quantitative Genetics

DNA Detective: Complex Patterns of Inheritance and DNA Fingerprinting

Genetically Modified Organisms: Gene Expression, Mutation, and Cloning

Where Did We Come From? The Evidence for Evolution

An Evolving Enemy: Natural Selection

Prospecting for Biological Gold: Biodiversity and Classification

Is the Human Population Too Large? Population Ecology

Conserving Biodiversity: Community and Ecosystem Ecology

Where Do You Live? Climate and Biomes

Organ Donation: Tissues Organs and Organ Systems

Clearing the Air: Respiratory Cardiovascular and Excretory Systems

Vaccinations: Protection and Prevention or Peril? Immune System

Sex Differences and Athleticism: Endocrine Skeletal and Muscular Systems

Is There Something in the Water? Reproductive and Developmental Biology

Attention Deficit Disorder: Brain Structure and Function

Feeding the World: Plant Structure and Growth

Growing a Green Thumb: Plant Physiology

Filters