Population Genetics

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Question 1

Free

Short Answer

Please select the best match for each term.
A)gene flow.
B)overdominance.
C)genetic drift.
D)postzygotic isolation.
E)genetic hitchhiking.
-1)Favorable alleles of genes can cause selection for an allele of an unrelated linked gene,a phenomenon known as
2)Sickle-cell heterozygotes have a selective advantage,exhibiting
3)Immigration of individuals with different allele frequencies into a population causes
4)Hybrid sterility is an example of
5)Very small,isolated populations are subject to

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Question 2

Free

Multiple Choice

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

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0.81.

0.30.

0.10.

0.09.

0.01.

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Question 3

Free

Multiple Choice

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

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DNA sequencing

VNTRs

Protein electrophoresis

Phenotypic observation

RFLP analysis

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Question 4

Free

Multiple Choice

Allele frequencies can change across the geographic range of a species according to climate,geological features,or direction in the range.For instance,a certain allele frequency might go up along with the elevation or down as you go south in the species' range.This systematic change in frequency is referred to as

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genetic drift.

q².

directional selection.

a cline.

heterosis.

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Question 5

Free

Multiple Choice

Which of the following is not a form of genetic drift?

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Founder effect

Nonrandom mating

Population bottleneck

Heterozygote advantage

All of these are forms of genetic drift.

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Question 6

Multiple Choice

Genetic drift may lead to

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loss of genetic variation in a population.

a decrease in the mutation rate of a particular gene.

increased heterozygosity at many loci.

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Question 7

Multiple Choice

What is the observed genotypic frequency of Aa individuals?

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0.144

0.72

0.40

0.48

1.44

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Question 8

Multiple Choice

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

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0.16

0.04

0.40

0.64

0.40

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Question 9

Multiple Choice

Synonymous mutations are found much more frequently than nonsynonymous mutations because

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mutations do not occur randomly

the genetic code is redundant.

of genetic drift.

there is a selective advantage in looking like another species.

changes in the amino acid sequence of proteins are likely to be harmful.

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Question 10

Multiple Choice

________ is the ultimate source of genetic variation in populations.

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Natural selection

Genetic drift

Gene flow

Mutation

Recombination

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Question 11

Multiple Choice

In a population of frogs,RR homozygotes produce an average of 5 offspring that survive to reproduce.Rr frogs produce 4,and rr frogs produce 1.The fitness of the three genotypes w₁₁,w₁₂,and w₂₂ are respectively

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5,4,and 1.

0.5,0.4,and 0.1.

1.0.,0.8,and 0.2.

0.5,1.0,and 0.1.

None of these

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Question 12

Multiple Choice

In reciprocal hybrid crosses,the heterogametic sex is typically sterile while the homogametic sex is not.This phenomenon is referred to as

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hybrid incompatibility.

postzygotic isolation.

Haldane's rule.

male sterility.

None of these

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Question 13

Multiple Choice

A population genetic study of a certain insect revealed four alleles for the GPI (glucose-phosphate isomerase)locus.How many different genotypic classes should be found?

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Question 14

Multiple Choice

Heterozygotes for the sickle-cell allele show higher fitness than either homozygote genotype in malarial regions.This is an example of

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epistasis.

pleiotropy.

founder effect.

overdominance.

codominance.

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Question 15

Multiple Choice

For which of the following traits is human mating expected to be nonrandom?

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Blood type

Isocitrate dehydrogenase enzyme

Skin color

Presence or absence of a widow's peak

Fingerprint loci

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Question 16

Multiple Choice

Twenty loci are screened for genetic variation in a common caterpillar species.Four loci are found to have two or more alleles.The proportion of polymorphic loci for this population is thus

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0.10.

0.20.

0.30.

0.40.

0.50.

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Question 17

Multiple Choice

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

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gametic isolation.

temporal isolation.

ecological isolation.

mechanical isolation.

All of these

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Question 18

True/False

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

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True

False

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Question 19

True/False

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.

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True

False

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Question 20

True/False

The

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True

False

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Population Genetics

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

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

Which of the following is not a form of genetic drift?

Genetic drift may lead to

What is the observed genotypic frequency of Aa individuals?

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

Synonymous mutations are found much more frequently than nonsynonymous mutations because

________ is the ultimate source of genetic variation in populations.

In a population of frogs,RR homozygotes produce an average of 5 offspring that survive to reproduce.Rr frogs produce 4,and rr frogs produce 1.The fitness of the three genotypes w11,w12,and w22 are respectively

In reciprocal hybrid crosses,the heterogametic sex is typically sterile while the homogametic sex is not.This phenomenon is referred to as

A population genetic study of a certain insect revealed four alleles for the GPI (glucose-phosphate isomerase)locus.How many different genotypic classes should be found?

Heterozygotes for the sickle-cell allele show higher fitness than either homozygote genotype in malarial regions.This is an example of

For which of the following traits is human mating expected to be nonrandom?

Twenty loci are screened for genetic variation in a common caterpillar species.Four loci are found to have two or more alleles.The proportion of polymorphic loci for this population is thus

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

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

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.

The

In a population of frogs,RR homozygotes produce an average of 5 offspring that survive to reproduce.Rr frogs produce 4,and rr frogs produce 1.The fitness of the three genotypes w₁₁,w₁₂,and w₂₂ are respectively