Question 1

Which of the following accurately describes the Hardy-Weinberg genotype frequency expression?

Accepted Answer

A)  P² + 2p +q² 
B)  P² + 2pq + q³ 
C)  P²+2pq+q² 
D)  P³ + 3pq+q³ 
E)  (p+q)³ 
A)  P² + 2p +q² 
B)  P² + 2pq + q³ 
C)  P²+2pq+q² 
D)  P³ + 3pq+q³ 
E)  (p+q)³

Question 2

In a sample of 500 men,240 have X-linked hemophilia and all the others have normal blood clotting.If men are hemizygous for the allele,what is the frequency for the X-linked hemophilia allele?

Accepted Answer

A)  0.1 
B)  0.12 
C)  0.24 
D)  0.48 
E)  0.88 
A)  0.1 
B)  0.12 
C)  0.24 
D)  0.48 
E)  0.88

Question 3

What general effect does random genetic drift have on populations?
1)It reduces the dominant homozygosity.
2)It reduces the heterozgosity.
3)It reduces the recessive homozygosity.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 3 
E)  All of these 
A)  1 
B)  2 
C)  3 
D)  1 and 3 
E)  All of these

Question 4

Which of the following is true regarding determining the number of alleles in a population sample? 1.It may be impossible to count the number of alleles if one allele is dominant.
2)When counting X-linked alleles it is only important to count the different alleles in males.
3)Codominant alleles can always be counted because they produce unique phenotypes.

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these 
A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these

Question 5

Which of the following human diseases is associated with balancing selection?

Accepted Answer

A)  Tay Sachs 
B)  Down Syndrome 
C)  Sickle Cell Anemia 
D)  Lesch-Nyhan Syndrome 
E)  Alzheimers Disease 
A)  Tay Sachs 
B)  Down Syndrome 
C)  Sickle Cell Anemia 
D)  Lesch-Nyhan Syndrome 
E)  Alzheimers Disease

Question 6

Selection against a deleterious recessive allele is replenished in the population by mutation,and leads to a dynamic equilibrium in which the frequency of the recessive allele is a simple function of the mutation rate and the selection coefficient.Which formula represents this situation?

Accepted Answer

A)  p²+2pq+q² 
B)    
C)    
D)  1/2N 
E)  None of these 
A)  p²+2pq+q² 
B)    
C)    
D)  1/2N 
E)  None of these

Question 7

Which of the following allows one to predict a population's genotype frequencies from its allele frequencies?

Accepted Answer

A)  Hardy-Weinberg principle 
B)  East-Hayflick principle 
C)  Hooke-Van Leuwenhoek principle 
D)  Morgan-Hunt principle 
E)  None of these 
A)  Hardy-Weinberg principle 
B)  East-Hayflick principle 
C)  Hooke-Van Leuwenhoek principle 
D)  Morgan-Hunt principle 
E)  None of these

Question 8

In diploid organisms,the rate at which genetic variability is lost by random genetic drift is

Accepted Answer

A)  1/2N, where N is the population size. 
B)  1/3N, where N is the population size. 
C)  1/4N, where N is the population size. 
D)  1/5N, where N is the population size. 
E)  None of these 
A)  1/2N, where N is the population size. 
B)  1/3N, where N is the population size. 
C)  1/4N, where N is the population size. 
D)  1/5N, where N is the population size. 
E)  None of these

Question 9

What effect does consanguineous mating and assortative mating have on genotypic frequencies in populations?
1)Reduce the frequency of homozyotes
2)Increase the frequency of homozygotes
3)Reduce the frequency of heterozygotes

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 3 
E)  2 and 3 
A)  1 
B)  2 
C)  3 
D)  1 and 3 
E)  2 and 3

Question 10

What type of selection is demonstrated by the following chart?

Accepted Answer

Directiona

Question 11

What is explained by a major population genetics theory?
1)The number of individuals in a population
2)The allelic frequencies within a population
3)The number of individuals outside a population

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these 
A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these

Question 12

Selection that favors extreme values of a trait at the expense of intermediate values is known as

Accepted Answer

A)  directional selection. 
B)  disruptive selection. 
C)  stabilizing selection. 
D)  directional selection and disruptive selection. 
E)  All of these 
A)  directional selection. 
B)  disruptive selection. 
C)  stabilizing selection. 
D)  directional selection and disruptive selection. 
E)  All of these

Question 13

There are 300 individuals in sample group #1 taken from population X.Seventy-five individuals of sample group are homozygous for the trait in question (I?I?).Seventy five individuals are homozygous for the trait (I?I?).Everyone else is heterozygous (I?I?)for the trait.What is the frequency of allele A in the sample group,assuming the trait is controlled by a single gene?

Accepted Answer

A)  0 
B)  0.375 
C)  0.5 
D)  0.75 
E)  1 
A)  0 
B)  0.375 
C)  0.5 
D)  0.75 
E)  1

Question 14

The A-B-O blood types are determined by three alleles IA,IB,and i.In a population the frequency of individuals who are homozygous for type A blood is 0.063,the frequency of individuals who are homozygous for type B blood is 0.015,and the frequency of individuals are blood type O is 0.44.What is the frequency of all genotypes?

Accepted Answer

I^AI^A= 0.063; I^Ai = 0.33

Question 15

Which of the following is a type of non-random mating?

Accepted Answer

A)  Consanguinous mating 
B)  Assortative mating 
C)  Discoursive mating 
D)  Consanguinous mating and assortative mating 
E)  Assortative mating and discoursive mating 
A)  Consanguinous mating 
B)  Assortative mating 
C)  Discoursive mating 
D)  Consanguinous mating and assortative mating 
E)  Assortative mating and discoursive mating

Question 16

Which of the following can be calculated using a major population genetics theory?
1)The frequency of homozygous dominant and recessive individuals
2)The frequency of heterozygous individual
3)The frequency of a dominant allele

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these 
A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these

Question 17

The frequency of sickle cell anemia,caused by a homozygous condition (HbsHbs)is approximately 0.0016.The normal condition is also a homozygous condition (HbAHbA).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the carrier state (HbAHbs)?

Accepted Answer

A)  0.0228 
B)  0.0432 
C)  0.0768 
D)  0.0987 
E)  0.0384 
A)  0.0228 
B)  0.0432 
C)  0.0768 
D)  0.0987 
E)  0.0384

Question 18

Selection that favors intermediate values of a trait at the expense of extreme values is known as

Accepted Answer

A)  directional selection. 
B)  disruptive selection. 
C)  stabilizing selection. 
D)  directional selection and disruptive selection. 
E)  All of these 
A)  directional selection. 
B)  disruptive selection. 
C)  stabilizing selection. 
D)  directional selection and disruptive selection. 
E)  All of these

Question 19

Which of the following is a force that could upset the Hardy-Weinberg equilibrium?

Accepted Answer

A)  Mutation 
B)  Migration 
C)  Natural selection 
D)  Genetic drift 
E)  All of these 
A)  Mutation 
B)  Migration 
C)  Natural selection 
D)  Genetic drift 
E)  All of these

Question 20

The frequency of sickle cell anemia,caused by a homozygous condition (HbsHbs)is approximately 0.0016.The normal condition is also a homozygous condition (HbAHbB).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the Hbs allele?

Accepted Answer

A)  0.0004 
B)  0.04 
C)  0.4 
D)  0.9216 
E)  0.96 
A)  0.0004 
B)  0.04 
C)  0.4 
D)  0.9216 
E)  0.96

Exam 23: Population Genetics

Which of the following accurately describes the Hardy-Weinberg genotype frequency expression?

In a sample of 500 men,240 have X-linked hemophilia and all the others have normal blood clotting.If men are hemizygous for the allele,what is the frequency for the X-linked hemophilia allele?

What general effect does random genetic drift have on populations? 1)It reduces the dominant homozygosity. 2)It reduces the heterozgosity. 3)It reduces the recessive homozygosity.

Which of the following human diseases is associated with balancing selection?

Selection against a deleterious recessive allele is replenished in the population by mutation,and leads to a dynamic equilibrium in which the frequency of the recessive allele is a simple function of the mutation rate and the selection coefficient.Which formula represents this situation?

Which of the following allows one to predict a population's genotype frequencies from its allele frequencies?

In diploid organisms,the rate at which genetic variability is lost by random genetic drift is

What effect does consanguineous mating and assortative mating have on genotypic frequencies in populations? 1)Reduce the frequency of homozyotes 2)Increase the frequency of homozygotes 3)Reduce the frequency of heterozygotes

What type of selection is demonstrated by the following chart?

What is explained by a major population genetics theory? 1)The number of individuals in a population 2)The allelic frequencies within a population 3)The number of individuals outside a population

Selection that favors extreme values of a trait at the expense of intermediate values is known as

Which of the following is a type of non-random mating?

Which of the following can be calculated using a major population genetics theory? 1)The frequency of homozygous dominant and recessive individuals 2)The frequency of heterozygous individual 3)The frequency of a dominant allele

The frequency of sickle cell anemia,caused by a homozygous condition (HbsHbs)is approximately 0.0016.The normal condition is also a homozygous condition (HbAHbA).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the carrier state (HbAHbs)?

Selection that favors intermediate values of a trait at the expense of extreme values is known as

Which of the following is a force that could upset the Hardy-Weinberg equilibrium?

The frequency of sickle cell anemia,caused by a homozygous condition (HbsHbs)is approximately 0.0016.The normal condition is also a homozygous condition (HbAHbB).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the Hbs allele?

The Science Of Genetics

Cellular Reproduction

Mendelism The Basic Principles Of Inheritance

Extensions Of Mendelism

The Chromosomal Basis Of Mendelism

Variation In Chromosome Number And Structure

Linkage,Crossing Over,And Chromosome Mapping In …

The Genetics Of Bacteria And Their Viruses

DNA And The Molecular Structure Of Chromosomes

Replication Of DNA And Chromosomes

Transcription And RNA Processing

Translation And The Genetic Code

Mutation,DNA Repair,And Recombination

The Techniques Of Molecular Genetics

Genomics

Applications Of Molecular Genetics

Transposable Genetics Elements

Regulation Of Gene Expression In Prokaryotes

Regulation Of Gene Expression In Eukaryotes

The Genetic Control Of Animal Development

The Genetic Basis Of Cancer

Inheritance Of Complex Traits

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The frequency of sickle cell anemia,caused by a homozygous condition (Hb^sHb^s)is approximately 0.0016.The normal condition is also a homozygous condition (Hb^AHb^A).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the carrier state (Hb^AHb^s)?

The frequency of sickle cell anemia,caused by a homozygous condition (Hb^sHb^s)is approximately 0.0016.The normal condition is also a homozygous condition (Hb^AHb^B).Assuming the Hardy-Weinberg equilibrium applies,what is the frequency of the Hb^sallele?