Question 1

Which genotype is most likely to survive in a region of the world that contains malaria?

Accepted Answer

A)  Homozygous recessive for hemoglobin shape
B)  Heterozygous for hemoglobin shape
C)  Homozygous dominant for hemoglobin shape
D)  All genotypes have the same potential for survival in a region that contains malaria IncorrectE) C) and D)
F) None of the above B

Question 2

The bottleneck effect is thought to be responsible for the loss of variability and loss of fertility in the cheetah species.

Accepted Answer

A) True 
 B)False

Question 3

All the members of a single species that occupy a particular area at the same time are known as a:

Accepted Answer

A)  subspecies.
B)  gene pool.
C)  population.
D)  group.
E)  sub-population.F) C) and D)
G) A) and B)

Question 4

Variations within a population are maintained by

Accepted Answer

A)  mutation.
B)  genetic recombination due to fertilization.
C)  gene flow.
D)  All of the choices are correct.E) C) and D)
F) A) and D)

Question 5

Which of the following reflect(s) the likely presence of (a) gene mutation(s) ?

Accepted Answer

A)  Fruit flies subjected to intense radiation produce a wider array of variable offspring.
B)  A chemical leaking from the surface of an old abandoned coal mine alters a regulatory gene so that a cricket nymph develops an extra set of eyes.
C)  The bacteria that cause gonorrhea,a common sexually transmitted disease,have previously been killed by penicillin; however,after continuous usage of the antibiotic,penicillin-resistant strains are now becoming prevalent.
D)  Radiation causes an alteration in a DNA nucleotide sequence,which is discovered when mapped,but which appears to be neither increasing nor decreasing in successive generations.
E)  All of the choices are correct.F) A) and C)
G) A) and B)

Question 6

If the Hardy-Weinberg equilibrium is met,what is the net effect?

Accepted Answer

A)  evolution leading to a population better adapted to an unchanging environment
B)  evolution leading to a population better adapted to a changing environment
C)  very slow and continuous evolution with no increased adaptation
D)  no evolution because the alleles in the population remain the sameE) All of the above
F) C) and D)

Question 7

Mutations that result in resistance to specific antibiotics in bacterial organisms occur:

Accepted Answer

A)  only when the bacteria are exposed to the drug to which they become resistant.
B)  more often when the bacteria are exposed to the drug.
C)  at any time,even when the bacteria are not exposed to the drug.
D)  only when the bacteria are exposed to radiation or other mutagens.E) B) and D)
F) B) and C)

Question 8

What type of selection is occurring in a population if the distribution graph shifts from the left end of the spectrum to the far right end?

Accepted Answer

A)  directional
B)  stabilizing
C)  disruptive
D)  Populations do not undergo selection,they are fixed. CorrectE) A) and B)
F) All of the above

Question 9

The Founder Effect is an example of genetic drift in which rare alleles occur at a higher frequency in a population isolated from the general population.

Accepted Answer

A) True 
 B)False

Question 10

The recessive allele for sickle cell anemia is more prevalent in regions of Africa where malaria is prevalent,than it is in regions where there is no malaria.This is due to a:

Accepted Answer

A)  heterozygous advantage
B)  Founder Effect
C)  frequency dependent selection
D)  bottleneck effectE) A) and B)
F) All of the above A

Question 11

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Accepted Answer

A)  gene mutation.
B)  polymorphism.
C)  gene frequency.
D)  disruption.E) B) and C)
F) A) and B)

Question 12

Over the course of millions of years various environments have changed.As grasslands slowly took the place of forests the inhabitants were forced to adapt or they went extinct.During this time period the horse evolved from a small cat sized creature to the size of the modern horses we see today.This is an example of which type of natural selection?

Accepted Answer

A)  Directional
B)  Disruptive
C)  Stabilizing
D)  The horse did not undergo any type of Natural Selection during the course of its evolution.
E)  The horse has not been on the Earth for millions of years.F) C) and D)
G) B) and D)

Question 13

An allele becomes the most common allele in a population by becoming the dominant allele.

Accepted Answer

A) True 
 B)False

Question 14

Which statement is NOT true about natural selection?

Accepted Answer

A)  Directional selection occurs when one extreme phenotype is favored over another different extreme phenotype.
B)  Stabilizing selection favors an intermediate phenotype over either of the extreme phenotypes.
C)  Disruptive selection favors both of the extreme phenotypes over the intermediate phenotype.
D)  Directional selection leads to improved selection in a stable environment.
E)  Disruptive selection leads to polymorphism,favoring different forms of the same species.F) None of the above
G) All of the above

Question 15

Perissodus are small,scale-eating fish that live in Lake Tanganyika in Africa.They attack larger fish from behind.The right-mouthed Perissodus attack on the left side of the larger fish and the left-mouthed Perissodus attack on the right side of the larger fish.The existence of the right-mouthed variety ensures the equally successful existence of the left-mouthed variety.This is an example of:

Accepted Answer

A)  a heterozygous advantage
B)  frequency dependent selection
C)  genetic drift
D)  sexual selectionE) B) and C)
F) B) and D)

Question 16

In the case of the peppered moths in England,when Kettlewell set up cameras to document that more white or black moths were eaten by birds on clean or sooty trees,he was verifying which factor involved in evolution by natural selection?

Accepted Answer

A)  The organisms vary in traits and that these traits may be acquired during a lifetime.
B)  The variation is inherited.
C)  More young are born than can survive,so there will always be competition.
D)  Some individuals are better adapted to a particular environment than other individuals.E) A) and D)
F) B) and C)

Question 17

A student proposes that left-handedness is a recessive trait that is therefore hidden in much of the human population.A survey of a class of 36 students finds that 27 (0.75) are right-handed and 9 (0.25) are left-handed.Using the Hardy-Weinberg formula,what would the expected genotypes and allele frequencies be in this theoretical population?

Accepted Answer

A)  0.75 homozygous dominant and 0.25 homozygous recessive,and a 3-to-1,right-to-left handed allele ratio in the population.
B)  0.25 homozygous dominant,0.50 heterozygous,and 0.25 homozygous recessive,and a 0.75 dominant allele frequency and a 0.25 recessive allele frequency.
C)  0.25 homozygous dominant,0.50 heterozygous,and 0.25 homozygous recessive,and a 0.5 allele frequency for each allele.
D)  0.50 homozygous dominant,0.25 heterozygous,and 0.25 homozygous recessive,and a 0.5 allele frequency for each allele.
E)  They cannot be estimated using these limited data.F) B) and D)
G) C) and E)

Question 18

Which of the following would change the allele frequencies of a population?

Accepted Answer

A)  DNA is stable from generation to generation and does not change,so allele frequencies do not change.
B)  Tall people in a population preferentially marry other tall people and do not marry people who are short or average height.
C)  A population on an island remains isolated and no one leaves or moves onto the island.
D)  All of the above would change allele frequencies of a population.E) C) and D)
F) A) and D)

Question 19

What is the most plausible explanation for why the male of most bird species have elaborate plumage and mating rituals?

Accepted Answer

A)  Sexual selection
B)  Genetic mutations
C)  Gene flow
D)  Natural selection CorrectE) All of the above
F) A) and B)

Question 20

Which of the following conditions is not necessary to maintain the Hardy-Weinberg equilibrium?

Accepted Answer

A)  Large gene pool
B)  No migration
C)  Mutation
D)  Random mating
E)  No selection Incorrect: A large gene pool is necessary to maintain Hardy-Weinberg equilibrium.F) All of the above
G) A) and B) C

Exam 16: How Populations Evolve

Which genotype is most likely to survive in a region of the world that contains malaria?

Correct Answer
verified
B

The bottleneck effect is thought to be responsible for the loss of variability and loss of fertility in the cheetah species.

Correct Answer
verified

All the members of a single species that occupy a particular area at the same time are known as a:

Correct Answer
verified

Variations within a population are maintained by

Correct Answer
verified

Which of the following reflect(s) the likely presence of (a) gene mutation(s) ?

Correct Answer
verified

If the Hardy-Weinberg equilibrium is met,what is the net effect?

Correct Answer
verified

Mutations that result in resistance to specific antibiotics in bacterial organisms occur:

Correct Answer
verified

What type of selection is occurring in a population if the distribution graph shifts from the left end of the spectrum to the far right end?

Correct Answer
verified

The Founder Effect is an example of genetic drift in which rare alleles occur at a higher frequency in a population isolated from the general population.

Correct Answer
verified

The recessive allele for sickle cell anemia is more prevalent in regions of Africa where malaria is prevalent,than it is in regions where there is no malaria.This is due to a:

Correct Answer
verified
A

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Correct Answer
verified

Correct Answer
verified

An allele becomes the most common allele in a population by becoming the dominant allele.

Correct Answer
verified

Which statement is NOT true about natural selection?

Correct Answer
verified

Correct Answer
verified

In the case of the peppered moths in England,when Kettlewell set up cameras to document that more white or black moths were eaten by birds on clean or sooty trees,he was verifying which factor involved in evolution by natural selection?

Correct Answer
verified

Correct Answer
verified

Which of the following would change the allele frequencies of a population?

Correct Answer
verified

What is the most plausible explanation for why the male of most bird species have elaborate plumage and mating rituals?

Correct Answer
verified

Which of the following conditions is not necessary to maintain the Hardy-Weinberg equilibrium?

Correct Answer
verified
C

Exam 16: How Populations Evolve

Which genotype is most likely to survive in a region of the world that contains malaria?

Correct AnswerverifiedB

The bottleneck effect is thought to be responsible for the loss of variability and loss of fertility in the cheetah species.

Correct AnswerverifiedShow Answer

All the members of a single species that occupy a particular area at the same time are known as a:

Correct AnswerverifiedShow Answer

Variations within a population are maintained by

Correct AnswerverifiedShow Answer

Which of the following reflect(s) the likely presence of (a) gene mutation(s) ?

Correct AnswerverifiedShow Answer

If the Hardy-Weinberg equilibrium is met,what is the net effect?

Correct AnswerverifiedShow Answer

Mutations that result in resistance to specific antibiotics in bacterial organisms occur:

Correct AnswerverifiedShow Answer

What type of selection is occurring in a population if the distribution graph shifts from the left end of the spectrum to the far right end?

Correct AnswerverifiedShow Answer

The Founder Effect is an example of genetic drift in which rare alleles occur at a higher frequency in a population isolated from the general population.

Correct AnswerverifiedShow Answer

The recessive allele for sickle cell anemia is more prevalent in regions of Africa where malaria is prevalent,than it is in regions where there is no malaria.This is due to a:

Correct AnswerverifiedA

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An allele becomes the most common allele in a population by becoming the dominant allele.

Correct AnswerverifiedShow Answer

Which statement is NOT true about natural selection?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In the case of the peppered moths in England,when Kettlewell set up cameras to document that more white or black moths were eaten by birds on clean or sooty trees,he was verifying which factor involved in evolution by natural selection?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following would change the allele frequencies of a population?

Correct AnswerverifiedShow Answer

What is the most plausible explanation for why the male of most bird species have elaborate plumage and mating rituals?

Correct AnswerverifiedShow Answer

Which of the following conditions is not necessary to maintain the Hardy-Weinberg equilibrium?

Correct AnswerverifiedC

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C