Question 1

Explain what evolutionary biologists mean when they say that there are constraints on what natural selection can achieve.

Accepted Answer

Constraints are any factors that limit t

Question 2

Natural selection is a process that results in

Accepted Answer

A)  the characteristics of individuals changing over time. 
B)  the characteristics of populations changing over time. 
C)  no changes in characteristics of individuals or populations. 
D)  changes in the characteristics of both individuals and populations. 
A)  the characteristics of individuals changing over time. 
B)  the characteristics of populations changing over time. 
C)  no changes in characteristics of individuals or populations. 
D)  changes in the characteristics of both individuals and populations.

Question 3

Lenski and Travisano compared what happened to the fitness of cells in 12 replicate lines of E. coli. According to the graph shown, which of the following statements is true?

Accepted Answer

A)  Fitness increased in some of the lines and decreased in other lines. 
B)  Fitness increased initially, but after about 3,000 generations all of the lines reached their maximum fitness and quit evolving. 
C)  Fitness increased in every line, but to a different degree in each line. 
D)  Evolution by natural selection cannot be predicted at any level. 
A)  Fitness increased in some of the lines and decreased in other lines. 
B)  Fitness increased initially, but after about 3,000 generations all of the lines reached their maximum fitness and quit evolving. 
C)  Fitness increased in every line, but to a different degree in each line. 
D)  Evolution by natural selection cannot be predicted at any level.

Question 4

Populations of cliff swallows in Nebraska have experienced a significant decrease in the number
of road kills over the past 30 years. Describe two alternate hypotheses that could explain this observation, one that relies on natural selection and one that does not, and explain how you would
test these hypotheses.

Accepted Answer

One alternate hypothesis that relies on

Question 5

What does a species' life history strategy refer to?

Accepted Answer

A)  the traits of an individual organism over its lifetime 
B)  a schedule and manner of investment in survivorship and reproduction over the lifetime of an individual 
C)  morphological and physiological traits that arise due to the environmental conditions in which an organism develops 
D)  a strategy for preventing the spread of alleles among populations 
A)  the traits of an individual organism over its lifetime 
B)  a schedule and manner of investment in survivorship and reproduction over the lifetime of an individual 
C)  morphological and physiological traits that arise due to the environmental conditions in which an organism develops 
D)  a strategy for preventing the spread of alleles among populations

Question 6

The 2000-2004 drought in California dramatically shortened the growing season. What was the consequence of this for the mustard plant, Brassica rapa?

Accepted Answer

A)  The plants were unable to flower in time and therefore went extinct. 
B)  Natural selection led to earlier flowering time in the plants. 
C)  The plants had increased reproductive success in those years. 
D)  Those plants that had longer generation times had higher survival rates. 
A)  The plants were unable to flower in time and therefore went extinct. 
B)  Natural selection led to earlier flowering time in the plants. 
C)  The plants had increased reproductive success in those years. 
D)  Those plants that had longer generation times had higher survival rates.

Question 7

Natural selection requires that variation exists in a population and that the variation

Accepted Answer

A)  is generated by mechanisms other than mutation. 
B)  is heritable. 
C)  does not affect reproductive success. 
D)  is consistent across environments. 
A)  is generated by mechanisms other than mutation. 
B)  is heritable. 
C)  does not affect reproductive success. 
D)  is consistent across environments.

Explain what evolutionary biologists mean when they say that there are constraints on what natural selection can achieve.

Natural selection is a process that results in

Lenski and Travisano compared what happened to the fitness of cells in 12 replicate lines of E. coli. According to the graph shown, which of the following statements is true?

What does a species' life history strategy refer to?

The 2000-2004 drought in California dramatically shortened the growing season. What was the consequence of this for the mustard plant, Brassica rapa?

Natural selection requires that variation exists in a population and that the variation

An Overview of Evolutionary Biology

Early Evolutionary Ideas and Darwin S Insight

Phylogeny and Evolutionary History

Inferring Phylogeny

Transmission Genetics and the Sources of Genetic Variation

The Genetics of Populations

Evolution in Finite Populations

Evolution at Multiple Loci

Genome Evolution

The Origin and Evolution of Early Life

Major Transitions

Evolution and Development

Species and Speciation

Extinction and Evolutionary Trends

The Evolution of Sex

The Evolution of Sociality

Coevolution

Human Evolution

Evolution and Medicine

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Exam 3: Natural Selection

Explain what evolutionary biologists mean when they say that there are constraints on what natural selection can achieve.

Natural selection is a process that results in

Lenski and Travisano compared what happened to the fitness of cells in 12 replicate lines of E. coli. According to the graph shown, which of the following statements is true?

What does a species' life history strategy refer to?

The 2000-2004 drought in California dramatically shortened the growing season. What was the consequence of this for the mustard plant, Brassica rapa?

Natural selection requires that variation exists in a population and that the variation

An Overview of Evolutionary Biology

Early Evolutionary Ideas and Darwin S Insight

Phylogeny and Evolutionary History

Inferring Phylogeny

Transmission Genetics and the Sources of Genetic Variation

The Genetics of Populations

Evolution in Finite Populations

Evolution at Multiple Loci

Genome Evolution

The Origin and Evolution of Early Life

Major Transitions

Evolution and Development

Species and Speciation

Extinction and Evolutionary Trends

The Evolution of Sex

The Evolution of Sociality

Coevolution

Human Evolution

Evolution and Medicine

Filters