Question 1

Match between columns
                        Premises: Sickle-cell heterozygotes have a selective advantage,exhibiting
Hybrid sterility is an example of
Favorable alleles of genes can cause selection for an allele of an unrelated linked gene,a phenomenon known as
Immigration of individuals with different allele frequencies into a population causes
Very small,isolated populations are subject to

Accepted Answer

The Answer of postzygotic isolation. and overdominance. and genetic hitchhiking. is...

Question 2

A selection coefficient of 1 means zero fitness.

Accepted Answer

A) True 
 B)False  True

Question 3

The genetic variation between human "races," such as Africans and Europeans,is greater than the variation within a single race.

Accepted Answer

A) True 
 B)False  False

Question 4

Although bees carry pollen from tulip flowers to the blossoms on cherry trees,hybrid seeds are not produced because of

Accepted Answer

A) gametic isolation. 
B) temporal isolation. 
C) ecological isolation. 
D) mechanical isolation. 
E) All of these 
A) gametic isolation. 
B) temporal isolation. 
C) ecological isolation. 
D) mechanical isolation. 
E) All of these

Question 5

In the early twentieth century,evolutionary biologists argued whether there was enough genetic variation in populations to explain the diversity of life by natural selection.With the advent of protein electrophoresis and DNA-level analysis,the problem turned on its head: the neutralist school arose from the idea that there was too much genetic variation to be maintained by natural selection.What are some of the arguments and observations neutralists cited to support the idea that much variation is neither favored nor disfavored by natural selection?

Accepted Answer

More genetic variation is expected in no

Question 6

The Hardy-Weinberg relationship cannot be used to compute allele frequencies when one or more alleles are recessive.

Accepted Answer

A) True 
 B)False

Question 7

Two closely related insect species are active at different times of day,with one diurnal and the other nocturnal.This is an example of spatial isolation.

Accepted Answer

A) True 
 B)False

Question 8

The deciduous forest of eastern North America has experienced dramatic changes over the past two to three centuries,transitioning from a nearly continuous forested area to increasingly patchy areas of forest broken up by farming and development.Some species are more sensitive to severe habitat fragmentation than others.What are some characteristics that might make a species more susceptible to the effects of habitat and population fragmentation?

Accepted Answer

Habitat fragmentation leads to "islands"

Question 9

Show algebraically that under Hardy-Weinberg equilibrium, allele frequencies will not change from one generation to another.

Accepted Answer

The answer of Show algebraically that under Hardy-Weinberg equilibrium, allele...

Question 10

When the population mean for a given measured trait is observed to decline over the course of several generations,it is an example of disruptive selection.

Accepted Answer

A) True 
 B)False

Question 11

Two populations experience equally severe bottlenecks,reducing each to one-tenth of its original size.One population is in the bottleneck for one generation,and the other is in the bottleneck for five generations.You assess the heterozygosity of both populations after they have been restored to their prebottleneck size.What do you expect to find,and why?

Accepted Answer

The population that was bottlenecked for

Question 12

Which of the following methods is least useful for assessing levels of genetic variation in populations?

Accepted Answer

A) DNA sequencing 
B) VNTRs 
C) Protein electrophoresis 
D) Phenotypic observation 
E) RFLP analysis 
A) DNA sequencing 
B) VNTRs 
C) Protein electrophoresis 
D) Phenotypic observation 
E) RFLP analysis

Question 13

For a gene A, a geneticist studying a population of butterflies found the following genotypes:$\begin{array}{c}
\begin{array}{r}
108 \
144 \
48
\end{array} 
\begin{array}{lll}
 \text {$ A A $ butterflies }\
 \text {Aa butterflies }\
 \text { aa butterflies}
\end{array}
\end{array}$

-What is the frequency of the a allele in the butterfly population?

Accepted Answer

A) 0.16 
B) 0.04 
C) 0.40 
D) 0.64 
E) 0.40. 
A) 0.16 
B) 0.04 
C) 0.40 
D) 0.64 
E) 0.40.

Question 14

For a gene A, a geneticist studying a population of butterflies found the following genotypes:$\begin{array}{c}
\begin{array}{r}
108 \
144 \
48
\end{array} 
\begin{array}{lll}
 \text {$ A A $ butterflies }\
 \text {Aa butterflies }\
 \text { aa butterflies}
\end{array}
\end{array}$

-What is the observed genotypic frequency of Aa individuals?

Accepted Answer

A) 0.144 
B) 0.72 
C) 0.40 
D) 0.48 
E) 1.44 
A) 0.144 
B) 0.72 
C) 0.40 
D) 0.48 
E) 1.44

Question 15

Two neighboring Caribbean islands harbor iguana populations.One island (island A)has a total iguana population of 800,while the other (island B)has a population less than half that size,numbering 250.On island A,the frequency of an allele p is estimated at 0.75,while this same allele is present at a frequency of 0.90 on island B.During a hurricane tracking across the islands,a group of about 100 iguanas get rafted from island A to island B.What effect does this have on the frequency of allele p on island B?

Accepted Answer

The migrant subpopulation is 100/800,or

Question 16

For two populations to remain genetically homogenized,a significant proportion of the population of each must be exchanged at least every other generation.

Accepted Answer

A) True 
 B)False

Question 17

________ is the ultimate source of genetic variation in populations.

Accepted Answer

A) Natural selection 
B) Genetic drift 
C) Gene flow 
D) Mutation 
E) Recombination 
A) Natural selection 
B) Genetic drift 
C) Gene flow 
D) Mutation 
E) Recombination

Question 18

Red-green color blindness is an X-linked trait.In a population genetics study,1,000 people (500 men and 500 women)were tested for this trait,and 35 men were found to be color blind.Use this information to compute the frequency of the allele for color blindness and the wild-type allele in this population,and estimate the expected number of carrier females.

Accepted Answer

35/1,000 = 0.035 = q; this is the freque

Question 19

Some recessive mutations can be exceedingly debilitating or lethal when expressed in homozygotes.If their effects are so severe,why doesn't natural selection simply purge such alleles from the population completely?

Accepted Answer

Natural selection does act on these alle

Question 20

If there are two alleles of a gene,B and b,and the frequency of the B allele (p)is 0.90,the frequency of the b allele (q)is

Accepted Answer

A) 0.81. 
B) 0.30. 
C) 0.10. 
D) 0.09. 
E) 0.01. 
A) 0.81. 
B) 0.30. 
C) 0.10. 
D) 0.09. 
E) 0.01.

A selection coefficient of 1 means zero fitness.

The genetic variation between human "races," such as Africans and Europeans,is greater than the variation within a single race.

Although bees carry pollen from tulip flowers to the blossoms on cherry trees,hybrid seeds are not produced because of

The Hardy-Weinberg relationship cannot be used to compute allele frequencies when one or more alleles are recessive.

Two closely related insect species are active at different times of day,with one diurnal and the other nocturnal.This is an example of spatial isolation.

Show algebraically that under Hardy-Weinberg equilibrium, allele frequencies will not change from one generation to another.

When the population mean for a given measured trait is observed to decline over the course of several generations,it is an example of disruptive selection.

Which of the following methods is least useful for assessing levels of genetic variation in populations?

For a gene A, a geneticist studying a population of butterflies found the following genotypes: 108 144 48 A A butterflies Aa butterflies aa butterflies -What is the frequency of the a allele in the butterfly population?

For a gene A, a geneticist studying a population of butterflies found the following genotypes: 108 144 48 A A butterflies Aa butterflies aa butterflies -What is the observed genotypic frequency of Aa individuals?

For two populations to remain genetically homogenized,a significant proportion of the population of each must be exchanged at least every other generation.

________ is the ultimate source of genetic variation in populations.

Some recessive mutations can be exceedingly debilitating or lethal when expressed in homozygotes.If their effects are so severe,why doesn't natural selection simply purge such alleles from the population completely?

If there are two alleles of a gene,B and b,and the frequency of the B allele (p)is 0.90,the frequency of the b allele (q)is

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Mendelian Genetics

Chromosomal Basis of Inheritance

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Quantitative Genetics

Molecular Evolution

Filters

Exam 21: Population Genetics

A selection coefficient of 1 means zero fitness.

The genetic variation between human "races," such as Africans and Europeans,is greater than the variation within a single race.

Although bees carry pollen from tulip flowers to the blossoms on cherry trees,hybrid seeds are not produced because of

The Hardy-Weinberg relationship cannot be used to compute allele frequencies when one or more alleles are recessive.

Two closely related insect species are active at different times of day,with one diurnal and the other nocturnal.This is an example of spatial isolation.

Show algebraically that under Hardy-Weinberg equilibrium, allele frequencies will not change from one generation to another.

When the population mean for a given measured trait is observed to decline over the course of several generations,it is an example of disruptive selection.

Which of the following methods is least useful for assessing levels of genetic variation in populations?

For a gene A, a geneticist studying a population of butterflies found the following genotypes: 108 144 48 A A butterflies Aa butterflies aa butterflies -What is the frequency of the a allele in the butterfly population?

For a gene A, a geneticist studying a population of butterflies found the following genotypes: 108 144 48 A A butterflies Aa butterflies aa butterflies -What is the observed genotypic frequency of Aa individuals?

For two populations to remain genetically homogenized,a significant proportion of the population of each must be exchanged at least every other generation.

________ is the ultimate source of genetic variation in populations.

Some recessive mutations can be exceedingly debilitating or lethal when expressed in homozygotes.If their effects are so severe,why doesn't natural selection simply purge such alleles from the population completely?

If there are two alleles of a gene,B and b,and the frequency of the B allele (p)is 0.90,the frequency of the b allele (q)is

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Mendelian Genetics

Chromosomal Basis of Inheritance

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Quantitative Genetics

Molecular Evolution

Filters