Question 1

Within a few thousand generations, wolves were transformed into a variety of domestic dogs; this transformation was due to

Accepted Answer

A)  genetic drift. 
B)  disequilibrium. 
C)  mutation. 
D)  hidden variation. 
A)  genetic drift. 
B)  disequilibrium. 
C)  mutation. 
D)  hidden variation.

Question 2

Of the following, which evolutionary process has the greatest chance of reducing genetic variation in a population across the greatest number of genes at once?

Accepted Answer

A)  selection for a trait related to feeding 
B)  the sudden merging of two large populations that had been kept separate for several generations 
C)  selection for a trait related to reproduction 
D)  genetic drift in small populations 
A)  selection for a trait related to feeding 
B)  the sudden merging of two large populations that had been kept separate for several generations 
C)  selection for a trait related to reproduction 
D)  genetic drift in small populations

Question 3

Which of the following is true of phenylketonuria (PKU)?

Accepted Answer

A)  It can result in shortened limbs. 
B)  It is caused by the substitution of one allele for another at a single locus. 
C)  It is not a genetically inherited disease. 
D)  It is an adaptation to malaria. 
A)  It can result in shortened limbs. 
B)  It is caused by the substitution of one allele for another at a single locus. 
C)  It is not a genetically inherited disease. 
D)  It is an adaptation to malaria.

Question 4

Which of the following is true of genetic drift?

Accepted Answer

A)  It can cause isolated populations to become more similar to one another. 
B)  It can cause isolated populations to diverge from one another. 
C)  It can lead to genotyping of populations. 
D)  It can lead to karyotyping of populations. 
A)  It can cause isolated populations to become more similar to one another. 
B)  It can cause isolated populations to diverge from one another. 
C)  It can lead to genotyping of populations. 
D)  It can lead to karyotyping of populations.

Question 5

The character of "behavioral flexibility" evolved in the soapberry bug because it

Accepted Answer

A)  affected reproductive success. 
B)  occurs only in stable environments. 
C)  was not passed down from father to son. 
D)  made behaviorally flexible males stronger. 
A)  affected reproductive success. 
B)  occurs only in stable environments. 
C)  was not passed down from father to son. 
D)  made behaviorally flexible males stronger.

Question 6

Genetic drift always causes

Accepted Answer

A)  changes in gene frequencies that are random with respect to adaptation. 
B)  adaptive changes in gene frequencies. 
C)  maladaptive changes in gene frequencies. 
D)  no change in gene frequencies. 
A)  changes in gene frequencies that are random with respect to adaptation. 
B)  adaptive changes in gene frequencies. 
C)  maladaptive changes in gene frequencies. 
D)  no change in gene frequencies.

Question 7

How is variation maintained?

Accepted Answer

A)  There is blending during sexual reproduction. 
B)  Mutations are deleterious. 
C)  New variation is slowly added by mutation. 
D)  The genetic composition of offspring is a replica of their parents. 
A)  There is blending during sexual reproduction. 
B)  Mutations are deleterious. 
C)  New variation is slowly added by mutation. 
D)  The genetic composition of offspring is a replica of their parents.

Question 8

Mate guarding of females by males in soapberry bugs probably functions to

Accepted Answer

A)  protect the females from harassment by other females. 
B)  protect the females from predators. 
C)  stop other males from mating with them. 
D)  stop the females from eating. 
A)  protect the females from harassment by other females. 
B)  protect the females from predators. 
C)  stop other males from mating with them. 
D)  stop the females from eating.

Question 9

Imagine a population where there are 20 aa individuals, 50 Aa individuals, and 30 AA individuals. Imagine that selection acts against both homozygotes such that neither homozygote survives to adulthood. What is the frequency of each genotype in the next generation of zygotes?

Accepted Answer

A)  aa = 0, Aa = 1.0, and AA = 0 
B)  aa = 0.20, Aa = 0.60, and AA = 0.20 
C)  aa = 0.20, Aa = 0.50, and AA = 0.30 
D)  aa = 0.25, Aa = 0.50, and AA = 0.25 
A)  aa = 0, Aa = 1.0, and AA = 0 
B)  aa = 0.20, Aa = 0.60, and AA = 0.20 
C)  aa = 0.20, Aa = 0.50, and AA = 0.30 
D)  aa = 0.25, Aa = 0.50, and AA = 0.25

Question 10

Consider the following population: 40 aa, 30 Aa, and 30 AA individuals. What is the frequency of the a allele? Imagine that all of the recessive homozygotes die before reproductive age and that all other genotypes survive and produce equal numbers of offspring. What is the frequency of the a allele in the next generation? Explain your answers.

Accepted Answer

This question can be broken up into its

Question 11

Which of the following statements is correct?

Accepted Answer

A)  Hidden variation is not always present in continuously evolving traits. 
B)  Selection causes genotypic frequencies to reach equilibrium in one generation, and the distribution of phenotypes does not change. 
C)  Selection can lead to cumulative, long-term change. 
D)  Genetic variation is always expressed as phenotypic variation. 
A)  Hidden variation is not always present in continuously evolving traits. 
B)  Selection causes genotypic frequencies to reach equilibrium in one generation, and the distribution of phenotypes does not change. 
C)  Selection can lead to cumulative, long-term change. 
D)  Genetic variation is always expressed as phenotypic variation.

Question 12

Which of the following is true of continuously varying characters?

Accepted Answer

A)  They allow for blending of the effects of two genes, the blended version passed on to offspring. 
B)  They are likely to expose the genetic variation underlying a trait. 
C)  They always hide genetic variation. 
D)  They do not help to explain how variation is maintained. 
A)  They allow for blending of the effects of two genes, the blended version passed on to offspring. 
B)  They are likely to expose the genetic variation underlying a trait. 
C)  They always hide genetic variation. 
D)  They do not help to explain how variation is maintained.

Question 13

Which of the following cannot cause evolutionary change within a population?

Accepted Answer

A)  natural selection 
B)  nongenetic traits 
C)  mutation 
D)  random genetic drift 
A)  natural selection 
B)  nongenetic traits 
C)  mutation 
D)  random genetic drift

Question 14

Natural selection cannot make an elephant run as fast as a cheetah and fly like a bird. This is an example of

Accepted Answer

A)  a correlated response to selection. 
B)  disequilibrium. 
C)  physical constraints on natural selection. 
D)  fixation. 
A)  a correlated response to selection. 
B)  disequilibrium. 
C)  physical constraints on natural selection. 
D)  fixation.

Question 15

Although it would be advantageous for animals to be large enough to be invulnerable to predators, but agile enough to leap considerable distances, ________ make(s) this evolutionarily impossible.

Accepted Answer

A)  behavioral plasticity 
B)  physical constraints 
C)  genetic drift 
D)  gene flow 
A)  behavioral plasticity 
B)  physical constraints 
C)  genetic drift 
D)  gene flow

Question 16

Which of the following statements about environmental variation is true?

Accepted Answer

A)  It affects genotypic expression of characters. 
B)  It tends to blur together the phenotypes associated with different genotypes. 
C)  It does not direct selection. 
D)  It has no effect on phenotype. 
A)  It affects genotypic expression of characters. 
B)  It tends to blur together the phenotypes associated with different genotypes. 
C)  It does not direct selection. 
D)  It has no effect on phenotype.

Question 17

Genetic drift is strongest in

Accepted Answer

A)  small populations. 
B)  large populations. 
C)  medium-size populations. 
D)  populations out of equilibrium. 
A)  small populations. 
B)  large populations. 
C)  medium-size populations. 
D)  populations out of equilibrium.

Question 18

Explain how natural selection can move a population beyond its initial range of variation.

Accepted Answer

The initial range of observed variation

Question 19

Some male soapberry bugs adjust their mate-guarding behavior in response to the local environment. Males guard females more when

Accepted Answer

A)  females are relatively abundant. 
B)  females are relatively scarce. 
C)  the sex ratio is skewed toward females. 
D)  the sex ratio is balanced. 
A)  females are relatively abundant. 
B)  females are relatively scarce. 
C)  the sex ratio is skewed toward females. 
D)  the sex ratio is balanced.

Question 20

Explain why natural selection cannot evolve a camera-type eye from a compound eye.

Accepted Answer

A camera-type eye might be an improvemen

Within a few thousand generations, wolves were transformed into a variety of domestic dogs; this transformation was due to

Of the following, which evolutionary process has the greatest chance of reducing genetic variation in a population across the greatest number of genes at once?

Which of the following is true of phenylketonuria (PKU)?

Which of the following is true of genetic drift?

The character of "behavioral flexibility" evolved in the soapberry bug because it

Genetic drift always causes

How is variation maintained?

Mate guarding of females by males in soapberry bugs probably functions to

Imagine a population where there are 20 aa individuals, 50 Aa individuals, and 30 AA individuals. Imagine that selection acts against both homozygotes such that neither homozygote survives to adulthood. What is the frequency of each genotype in the next generation of zygotes?

Which of the following statements is correct?

Which of the following is true of continuously varying characters?

Which of the following cannot cause evolutionary change within a population?

Natural selection cannot make an elephant run as fast as a cheetah and fly like a bird. This is an example of

Although it would be advantageous for animals to be large enough to be invulnerable to predators, but agile enough to leap considerable distances, ________ make(s) this evolutionarily impossible.

Which of the following statements about environmental variation is true?

Genetic drift is strongest in

Explain how natural selection can move a population beyond its initial range of variation.

Some male soapberry bugs adjust their mate-guarding behavior in response to the local environment. Males guard females more when

Explain why natural selection cannot evolve a camera-type eye from a compound eye.

Adaptation by Natural Selection

Genetics

Speciation and Phylogeny

Primate Diversity and Ecology

Primate Mating Systems

The Evolution of Cooperation

Primate Life Histories and the Evolution of Intelligence

From Tree Shrew to Ape

The Earliest Hominins

Early Homo and H Erectus 26-1 Ma

The Neanderthals and Their Contemporaries

Homo Sapiens and the Evolution of Modern Human Behavior

Human Genetics and Variation

Evolution and Human Behavior

Culture, Cooperation, and Human Uniqueness

Filters

Exam 3: The Modern Synthesis

Within a few thousand generations, wolves were transformed into a variety of domestic dogs; this transformation was due to

Of the following, which evolutionary process has the greatest chance of reducing genetic variation in a population across the greatest number of genes at once?

Which of the following is true of phenylketonuria (PKU)?

Which of the following is true of genetic drift?

The character of "behavioral flexibility" evolved in the soapberry bug because it

Genetic drift always causes

How is variation maintained?

Mate guarding of females by males in soapberry bugs probably functions to

Imagine a population where there are 20 aa individuals, 50 Aa individuals, and 30 AA individuals. Imagine that selection acts against both homozygotes such that neither homozygote survives to adulthood. What is the frequency of each genotype in the next generation of zygotes?

Which of the following statements is correct?

Which of the following is true of continuously varying characters?

Which of the following cannot cause evolutionary change within a population?

Natural selection cannot make an elephant run as fast as a cheetah and fly like a bird. This is an example of

Although it would be advantageous for animals to be large enough to be invulnerable to predators, but agile enough to leap considerable distances, ________ make(s) this evolutionarily impossible.

Which of the following statements about environmental variation is true?

Genetic drift is strongest in

Explain how natural selection can move a population beyond its initial range of variation.

Some male soapberry bugs adjust their mate-guarding behavior in response to the local environment. Males guard females more when

Explain why natural selection cannot evolve a camera-type eye from a compound eye.

Adaptation by Natural Selection

Genetics

Speciation and Phylogeny

Primate Diversity and Ecology

Primate Mating Systems

The Evolution of Cooperation

Primate Life Histories and the Evolution of Intelligence

From Tree Shrew to Ape

The Earliest Hominins

Early Homo and H Erectus 26-1 Ma

The Neanderthals and Their Contemporaries

Homo Sapiens and the Evolution of Modern Human Behavior

Human Genetics and Variation

Evolution and Human Behavior

Culture, Cooperation, and Human Uniqueness

Filters