Question 1

In a forest,trees that get more sunlight grow taller than other nearby trees.This is a form of ________

Accepted Answer

A)  natural selection.
B)  stabilizing selection.
C)  disruptive selection.
D)  directional selection.
E)  artificial selection.F) A) and D)
G) None of the above

Question 2

In the Hardy-Weinberg equation,p and q are ________.

Accepted Answer

A)  allele frequencies
B)  genotypes
C)  phenotypes
D)  measures of fitness
E)  mutation ratesF) C) and D)
G) D) and E)

Question 3

Two parents who do not have sickle cell anemia have a child that has the disease.The parents are both:

Accepted Answer

A)  homozygous for the sickle cell allele.
B)  heterozygous for the sickle cell allele.
C)  homozygous for the normal allele.
D)  epistatic for the sickle cell allele.
E)  pleiotropic for the sickle cell allele.F) A) and E)
G) B) and C)

Question 4

________ could not be involved in gene flow.

Accepted Answer

A)  Wind-blown pollen
B)  Gametes dispersed by ocean currents
C)  Zygotes dispersed by ocean currents
D)  Disassortative mating within a population
E)  Hybridization between neighboring populationsF) None of the above
G) A) and E)

Question 5

In disruptive selection,over time

Accepted Answer

A)  a population goes extinct.
B)  the most extreme outliers of a population are eliminated (e.g.,the largest beaks and smallest beaks are eliminated) .
C)  the population is strongly selected for in one direction (e.g.,larger beak size) .
D)  the population is strongly selected for in two directions (e.g.,larger beak size and smaller beak size) .
E)  a population increases its variation (e.g.,a wide selection of all beak sizes) .F) B) and C)
G) B) and D)

Question 6

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Accepted Answer

A)  natural selection.
B)  creation of new species.
C)  genetic drift.
D)  outcrossing.
E)  increasing evolutionary resistance.F) None of the above
G) B) and C)

Question 7

The frequency of a particular allele within a population can be changed,over time,by

Accepted Answer

A)  genetic outflow.
B)  large population size.
C)  selection.
D)  inheritance of acquired characteristics.
E)  random mating.F) None of the above
G) A) and B)

Question 8

Darwin proposed that natural selection occurs in an environment by

Accepted Answer

A)  favoring heritable features that make the organism better suited to survive and reproduce.
B)  producing a constant number of offspring while in that environment.
C)  surviving for a fixed amount of time.
D)  resisting the environment and keeping the environment from changing.
E)  favoring those individuals with the most favorable acquired characteristics.F) B) and D)
G) D) and E)

Question 9

Large ears is a rare trait in a mainland population of mice.A few female mice homozygous for very large ears arrive at an island that already contains mice after sneaking onto a boat.This will lead to a population with a higher incidence of big ears than the mainland population because of ________

Accepted Answer

A)  a bottleneck effect.
B)  gene flow.
C)  increased mutation.
D)  genetic drift.
E)  natural selection.F) A) and B)
G) B) and D)

Question 10

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Accepted Answer

A)  0) 01
B)  0) 10
C)  0) 18
D)  0) 81
E)  0) 90F) A) and B)
G) B) and D)

Question 11

Genotypes are said to be in ________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Accepted Answer

A)  steady state
B)  homeostatic
C)  Hardy-Weinberg
D)  MendelianE) A) and B)
F) A) and C)

Question 12

Natural selection for a certain phenotype will affect the ________.

Accepted Answer

A)  allele frequency of a population
B)  allele frequency of an individual
C)  genotype of an individual
D)  genotype of a populationE) A) and C)
F) All of the above

Question 13

A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success.What would be the best followup experiment?

Accepted Answer

A)  Count the number of spots on female tails and measure mating success.
B)  Remove spots or add artificial spots to male tails and determine female responses.
C)  Measure the sperm count of males and compare to spot count.
D)  Inject testosterone and observe changes in spot count.E) B) and C)
F) A) and B)

Question 14

Platys and swordtails are related tropical freshwater fish.In studies,researchers have shown that female platys prefer males with swordtails,even though males of their own species do not have them.This was discovered by attaching artificial swordtails to platys males.What does this suggest about the origin of the swordtail feature?

Accepted Answer

A)  Female preference for swords may have predated the origin of the feature itself.
B)  Evolution of swords later led to evolution of female preference for swords.
C)  The same gene that causes sword development also causes development of neural circuits for female preference.
D)  Adjacent genes on the same chromosome cause sword development and development of neural circuits for female preference.E) A) and D)
F) A) and C)

Question 15

Pea fowl (peacocks and peahens) show sexual dimorphism -- males have long blue-green tail feathers with eyespots,while females have short brown tail feathers.Which statement best describes the graphed data about peacocks?

Accepted Answer

A)  There are no peacocks with less than 140 eyespots.
B)  The fewer eyespots that a peacock has in his tail,the more mates he attracts.
C)  Actually eyespots have very little to do with mate-attracting activities.
D)  The more eyespots that a peacock has in his tail,the more mates he attracts.
E)  There are no peacocks with more than 165 eyespots.F) A) and D)
G) B) and E)

Question 16

The recessive phenotype of a trait occurs in 16% of a population.What is the frequency of the dominant allele?

Accepted Answer

A)  0) 16
B)  0) 36
C)  0) 40
D)  0) 48
E)  0) 60F) A) and B)
G) None of the above

Question 17

In the graph above,which baby characteristics would explain the percent infant mortality curve and any subsequent effects on fitness?

Accepted Answer

A)  The baby needs to be large enough to survive after birth,but small enough for a safe delivery.
B)  The larger the baby the better the chance of survival.
C)  The smaller the baby the better the chance of survival.
D)  The baby needs to be small enough to survive after birth,but large enough for a safe delivery.
E)  There is no correlation between birth weight and survival.F) A) and B)
G) D) and E)

Question 18

The observation that most pureblood Native Americans have type O blood is best explained by ________

Accepted Answer

A)  a founder effect.
B)  gene flow.
C)  genetic drift.
D)  assortative mating.
E)  frequent mutations.F) C) and D)
G) B) and E)

Exam 20: Genes Within Populations

Two parents who do not have sickle cell anemia have a child that has the disease.The parents are both:

Correct Answer
verified

In the Hardy-Weinberg equation,p and q are ________.

Correct Answer
verified

Correct Answer
verified

The recessive phenotype of a trait occurs in 16% of a population.What is the frequency of the dominant allele?

Correct Answer
verified

The frequency of a particular allele within a population can be changed,over time,by

Correct Answer
verified

The observation that most pureblood Native Americans have type O blood is best explained by ________

Correct Answer
verified

Pea fowl (peacocks and peahens) show sexual dimorphism -- males have long blue-green tail feathers with eyespots,while females have short brown tail feathers.Which statement best describes the graphed data about peacocks?

Correct Answer
verified

A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success.What would be the best followup experiment?

Correct Answer
verified

In the graph above,which baby characteristics would explain the percent infant mortality curve and any subsequent effects on fitness?

Correct Answer
verified

Darwin proposed that natural selection occurs in an environment by

Correct Answer
verified

In a forest,trees that get more sunlight grow taller than other nearby trees.This is a form of ________

Correct Answer
verified

Genotypes are said to be in ________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Correct Answer
verified

________ could not be involved in gene flow.

Correct Answer
verified

Natural selection for a certain phenotype will affect the ________.

Correct Answer
verified

Large ears is a rare trait in a mainland population of mice.A few female mice homozygous for very large ears arrive at an island that already contains mice after sneaking onto a boat.This will lead to a population with a higher incidence of big ears than the mainland population because of ________

Correct Answer
verified

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Correct Answer
verified

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Correct Answer
verified

In disruptive selection,over time

Correct Answer
verified

Exam 20: Genes Within Populations

Two parents who do not have sickle cell anemia have a child that has the disease.The parents are both:

Correct AnswerverifiedShow Answer

In the Hardy-Weinberg equation,p and q are ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The recessive phenotype of a trait occurs in 16% of a population.What is the frequency of the dominant allele?

Correct AnswerverifiedShow Answer

The frequency of a particular allele within a population can be changed,over time,by

Correct AnswerverifiedShow Answer

The observation that most pureblood Native Americans have type O blood is best explained by ________

Correct AnswerverifiedShow Answer

Pea fowl (peacocks and peahens) show sexual dimorphism -- males have long blue-green tail feathers with eyespots,while females have short brown tail feathers.Which statement best describes the graphed data about peacocks?

Correct AnswerverifiedShow Answer

A study finds a positive correlation between the number of spots on the tail of male peacocks and their mating success.What would be the best followup experiment?

Correct AnswerverifiedShow Answer

In the graph above,which baby characteristics would explain the percent infant mortality curve and any subsequent effects on fitness?

Correct AnswerverifiedShow Answer

Darwin proposed that natural selection occurs in an environment by

Correct AnswerverifiedShow Answer

In a forest,trees that get more sunlight grow taller than other nearby trees.This is a form of ________

Correct AnswerverifiedShow Answer

Genotypes are said to be in ________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Correct AnswerverifiedShow Answer

________ could not be involved in gene flow.

Correct AnswerverifiedShow Answer

Natural selection for a certain phenotype will affect the ________.

Correct AnswerverifiedShow Answer

Large ears is a rare trait in a mainland population of mice.A few female mice homozygous for very large ears arrive at an island that already contains mice after sneaking onto a boat.This will lead to a population with a higher incidence of big ears than the mainland population because of ________

Correct AnswerverifiedShow Answer

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Correct AnswerverifiedShow Answer

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Correct AnswerverifiedShow Answer

In disruptive selection,over time

Correct AnswerverifiedShow Answer

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