Question 1

In a population of 1000 plants, the frequency of the a allele is 5 percent. Suppose a fire causes the loss of 500 individuals who are homozygous for the A allele. In this case the fire caused the frequency of a to change from ______ to ______.

Accepted Answer

A)   5; 1
B)   0.05; 1.0
C)   0.05; 0.1
D)   0.5; 1.0
E)   0.5; 0.1

Question 2

According to the gradualism model:

Accepted Answer

A)   the fossil record accurately reflects evolutionary history.
B)   the origin of genera requires mechanisms different from those involved in the origin of species.
C)   evolution occurs by the accumulation of many small changes in the frequencies of genes in a gene pool.
D)   species arise abruptly.
E)   new fossil forms appear rather suddenly in strata.

Question 3

Coevolution occurs when one species exerts a strong selective force on another.

Accepted Answer

A) True 
 B)False

Question 4

When plants heterozygous for a trait self-pollinate there will be a(n) :

Accepted Answer

A)   decrease in the frequency of individuals homozygous recessive for that trait.
B)   decrease in the frequency of individuals homozygous dominant for that trait.
C)   decrease in the frequency of individuals heterozygous for that trait.
D)   increase in the frequency of individuals heterozygous for that trait.
E)   increase in the frequency of homozygous recessive individuals but a decrease in homozygous dominant individuals. C

Question 5

Tragopogon mirus and Tragopogon miscellus are examples of species formed by:

Accepted Answer

A)   allopatric speciation.
B)   heterozygote advantage.
C)   coevolution.
D)   allopolyploid speciation.
E)   autopolyploid speciation.

Question 6

Genetic drift tends to have a greater impact on evolution in large populations than in small populations.

Accepted Answer

A) True 
 B)False

Question 7

Cross-pollination between individuals of the same species is called:

Accepted Answer

A)   polyploidization.
B)   hybridization.
C)   recombination speciation.
D)   outcrossing.
E)   apomixis.

Question 8

An example of natural selection is a plant breeder developing a new variety of rose.

Accepted Answer

A) True 
 B)False

Question 9

According to the Hardy-Weinberg Law, over long periods a dominant allele will drive out a recessive allele from a population.

Accepted Answer

A) True 
 B)False

Question 10

______ is the sum total of all the alleles of all the genes in a population.

Accepted Answer

A)   The genotype
B)   The gene pool
C)   Evolution
D)   Population genetics
E)   A species

Question 11

According to the theory of punctuated equilibrium:

Accepted Answer

A)   macroevolution occurs more readily than microevolution.
B)   species evolve by the gradual accumulation of many small changes.
C)   the fossil record is flawed.
D)   long periods of little phyletic change are interrupted by short periods of rapid change.
E)   new species do not "suddenly" appear.

Question 12

Gene flow can introduce new alleles into a population.

Accepted Answer

A) True 
 B)False

Question 13

In a population, natural selection:

Accepted Answer

A)   can preserve and promote variability.
B)   eliminates only the "less fit."
C)   acts on the genotype.
D)   reduces genetic variability.
E)   reduces the potential for further evolution.

Question 14

The raw material for evolutionary change is provided by:

Accepted Answer

A)   sexual reproduction.
B)   asexual reproduction.
C)   mutations.
D)   meiosis.
E)   mitosis.

Question 15

Humans breed plants and animals through the process of:

Accepted Answer

A)   artificial selection.
B)   natural selection.
C)   survival of the fittest.
D)   evolution.
E)   mutation. A

Question 16

Which of the following statements concerning recombination speciation in sunflowers is FALSE?

Accepted Answer

A)   It involves polyploidy.
B)   It is a type of sympatric speciation.
C)   The hybrids are initially semisterile.
D)   It results from gene combinations being rearranged over several generations.
E)   It has been duplicated in the laboratory.

Question 17

The experiments with Oxyria digyna and Solidago virgaurea provide evidence that:

Accepted Answer

A)   natural selection does not always result in adaptation.
B)   these species lack developmental plasticity.
C)   clines can sometimes be ignored.
D)   coevolution had occurred.
E)   ecotypes differ physiologically.

Question 18

One approach of the phylogenetic species concept states that species are defined on the basis of their:

Accepted Answer

A)   ability to interbreed.
B)   inability to interbreed.
C)   ability to form fertile hybrids.
D)   ability to form ecotypes with other species.
E)   historical relatedness to other organisms in the species.

Question 19

By definition, _______ is the term that refers to changes in a gene pool due to chance.

Accepted Answer

A)   mutation
B)   genetic drift
C)   gene flow
D)   natural selection
E)   nonrandom mating B

Question 20

Which of the following is NOT a necessary condition for a population to be in Hardy-Weinberg equilibrium?

Accepted Answer

A)   no natural selection
B)   isolation from other populations
C)   no mutations
D)   nonrandom mating
E)   large population size

Exam 11: The Process of Evolution

In a population of 1000 plants, the frequency of the a allele is 5 percent. Suppose a fire causes the loss of 500 individuals who are homozygous for the A allele. In this case the fire caused the frequency of a to change from ______ to ______.

Correct AnswerverifiedShow Answer

According to the gradualism model:

Correct AnswerverifiedShow Answer

Coevolution occurs when one species exerts a strong selective force on another.

Correct AnswerverifiedShow Answer

When plants heterozygous for a trait self-pollinate there will be a(n) :

Correct AnswerverifiedC

Tragopogon mirus and Tragopogon miscellus are examples of species formed by:

Correct AnswerverifiedShow Answer

Genetic drift tends to have a greater impact on evolution in large populations than in small populations.

Correct AnswerverifiedShow Answer

Cross-pollination between individuals of the same species is called:

Correct AnswerverifiedShow Answer

An example of natural selection is a plant breeder developing a new variety of rose.

Correct AnswerverifiedShow Answer

According to the Hardy-Weinberg Law, over long periods a dominant allele will drive out a recessive allele from a population.

Correct AnswerverifiedShow Answer

______ is the sum total of all the alleles of all the genes in a population.

Correct AnswerverifiedShow Answer

According to the theory of punctuated equilibrium:

Correct AnswerverifiedShow Answer

Gene flow can introduce new alleles into a population.

Correct AnswerverifiedShow Answer

In a population, natural selection:

Correct AnswerverifiedShow Answer

The raw material for evolutionary change is provided by:

Correct AnswerverifiedShow Answer

Humans breed plants and animals through the process of:

Correct AnswerverifiedA

Which of the following statements concerning recombination speciation in sunflowers is FALSE?

Correct AnswerverifiedShow Answer

The experiments with Oxyria digyna and Solidago virgaurea provide evidence that:

Correct AnswerverifiedShow Answer

One approach of the phylogenetic species concept states that species are defined on the basis of their:

Correct AnswerverifiedShow Answer

By definition, _______ is the term that refers to changes in a gene pool due to chance.

Correct AnswerverifiedB

Which of the following is NOT a necessary condition for a population to be in Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

In a population of 1000 plants, the frequency of the a allele is 5 percent. Suppose a fire causes the loss of 500 individuals who are homozygous for the A allele. In this case the fire caused the frequency of a to change from to .

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C

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A

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B

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