Question 1

Which of the following is true about genetic drift?

Accepted Answer

A)  It is more likely to occur in a large population than in a small population.
B)  It may lead to an allele becoming fixed in a population.
C)  It increases the number of heterozygotes in a population.
D)  It increases the frequency of rare alleles in a population.E) A) and D)
F) B) and C)

Question 2

If there is gene flow between two adjacent populations of the same species,then the two populations will

Accepted Answer

A)  have similar gene pools.
B)  become isolated from each other.
C)  develop into different species.
D)  adapt to different conditions and become separate.E) A) and C)
F) A) and B)

Question 3

A population of organisms that reproduce asexually will display more variation than a population that reproduces sexually.

Accepted Answer

A) True 
 B)False

Question 4

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

Accepted Answer

A)  small population
B)  no net migration of alleles into or out of the population
C)  no net mutations
D)  no selection of one phenotype over another
E)  random mating populationF) A) and C)
G) A) and E)

Question 5

A population was surveyed to determine the percentage of individuals with detached earlobes and attached earlobes.16% of the population was found to have attached earlobes,a trait coded for by a recessive allele.Calculate the allele,genotype and phenotype frequencies of the population,assuming Hardy-Weinberg equilibrium is maintained.

Accepted Answer

An attached earlobe is the expression of...

Question 6

Explain why male baboons have evolved to be larger than the females of the species.

Accepted Answer

Baboons live in a society in which the m...

Question 7

A dominant allele is found in a population with a frequency of 0.8.As the environment begins to change,the dominant allele is not favored.Scientists find that the frequency of the dominant allele decreases by half each generation.What are the allele,genotype,and phenotype frequencies before and one generation after the population begins to change? Is Hardy-Weinberg equilibrium maintained?

Accepted Answer

No.Hardy-Weinberg equilibrium is not mai...

Question 8

Variation within a population is maintained by

Accepted Answer

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

Question 9

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 gradually 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)  artificial
E)  driftF) B) and C)
G) C) and D)

Question 10

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 selectionF) A) and E)
G) C) and D)

Question 11

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

Accepted Answer

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

Question 12

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) All of the above
F) A) and B)

Question 13

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Accepted Answer

A) True 
 B)False

Question 14

What is the term used to describe the changes in allele frequencies of a population over generations?

Accepted Answer

A)  genetic drift
B)  founder effect
C)  microevolution
D)  directional selectionE) B) and C)
F) C) and D)

Question 15

The most common source of genetic variation in sexually reproducing organisms is

Accepted Answer

A)  mutation.
B)  recombination of alleles through meiosis and fertilization.
C)  duplication of chromosomes.
D)  duplication of genes.E) B) and D)
F) A) and B)

Exam 16: How Populations Evolve

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Correct Answer
verified

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

Correct Answer
verified

Explain why male baboons have evolved to be larger than the females of the species.

Correct Answer
verified
Baboons live in a society in which the m...
View Answer

What is the term used to describe the changes in allele frequencies of a population over generations?

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified
An attached earlobe is the expression of...
View Answer

Correct Answer
verified
No.Hardy-Weinberg equilibrium is not mai...
View Answer

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

Correct Answer
verified

Which of the following is true about genetic drift?

Correct Answer
verified

The most common source of genetic variation in sexually reproducing organisms is

Correct Answer
verified

If there is gene flow between two adjacent populations of the same species,then the two populations will

Correct Answer
verified

A population of organisms that reproduce asexually will display more variation than a population that reproduces sexually.

Correct Answer
verified

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

Correct Answer
verified

Variation within a population is maintained by

Correct Answer
verified

Correct Answer
verified

Exam 16: How Populations Evolve

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Explain why male baboons have evolved to be larger than the females of the species.

Correct AnswerverifiedBaboons live in a society in which the m...View AnswerShow Answer

What is the term used to describe the changes in allele frequencies of a population over generations?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedAn attached earlobe is the expression of...View AnswerShow Answer

Correct AnswerverifiedNo.Hardy-Weinberg equilibrium is not mai...View AnswerShow Answer

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

Which of the following is true about genetic drift?

Correct AnswerverifiedShow Answer

The most common source of genetic variation in sexually reproducing organisms is

Correct AnswerverifiedShow Answer

If there is gene flow between two adjacent populations of the same species,then the two populations will

Correct AnswerverifiedShow Answer

A population of organisms that reproduce asexually will display more variation than a population that reproduces sexually.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Variation within a population is maintained by

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Baboons live in a society in which the m...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
An attached earlobe is the expression of...
View Answer

Correct Answer
verified
No.Hardy-Weinberg equilibrium is not mai...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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