Question 1

In bacteria,what is contained within the IS elements?

Accepted Answer

A)  transposase gene
B)  short tandem repeats
C)  inverted repeats
D)  Both A and B are correct.
E)  Both A and C are correct.

Question 2

Gametes produced by inversion heterozygotes can produce no viable recombinant chromosomes due to what phenomenon?

Accepted Answer

crossover ...

Question 3

What structure,seen during synapsis,is indicative of a chromosome inversion?

Accepted Answer

The answer of What structure,seen during synapsis,is indicative of a...

Question 4

A chromosome contains the following gene order: A B C D • E F G H
Which of the following rearrangements represents a pericentric inversion?

Accepted Answer

A)  A B C • D E F G H
B)  A F G H • B C D E
C)  A C B D • E F G H
D)  A F D E • C B G H
E)  A B C D • H G F E

Question 5

Humans with the condition of familial Down syndrome exhibit which type of chromosomal aberration?

Accepted Answer

A)  chromosome 21 duplication
B)  chromosome 21 inversion
C)  chromosome 14/21 Robertsonian translocation
D)  chromosome 21 deletion
E)  trisomy of chromosome 21

Question 6

Of the various genetic elements described by McClintock,which one is classified as an autonomous transposable element?

Accepted Answer

The answer of Of the various genetic elements described by...

Question 7

What sequences or structures within the DNA can be used to identify sites of transposition?

Accepted Answer

A)  target site duplication and direct repeats
B)  target site duplication and short tandem repeats
C)  inverted loops
D)  target site inversion and direct repeats
E)  chromosome translocation and insertion of transposase gene

Question 8

In Drosophila and Lepidoptera,sex-chromosome mosaicism produces what type of sexually ambiguous phenotype?

Accepted Answer

The answer of In Drosophila and Lepidoptera,sex-chromosome mosaicism produces what...

Question 9

Pseudodominance is used to map genes by using what method?

Accepted Answer

The answer of Pseudodominance is used to map genes by...

Question 10

In an allopolyploid organism,what is true regarding the fertility of interspecies hybrids?

Accepted Answer

A)  Interspecies hybrids are fertile due to nonhomology of chromosomes.
B)  Chromosome doubling and nondisjunction in gametocytes can lead to homologous chromosome pairing,disjunction,and fertile hybrids.
C)  Interspecies hybrids will be fertile so long as there is an even number of chromosomes in the offspring.
D)  Mitotic nondisjunction results in haploid cells.
E)  Meiotic nondisjunction produces three haploid gametes and one diploid gamete.

Question 11

How is aneuploidy different from polyploidy? What are the mechanisms by which aneuploidy and polyploidy are caused,and what are the consequences of these chromosomal alterations in terms of survival and fertility of the offspring?

Accepted Answer

Aneuploidy occurs when one or more chrom...

Question 12

An organism with a genome size of n = 23 experienced a Robertsonian translocation.How many chromosomes would you expect to see in the karyotype of a somatic cell in an affected individual?

Accepted Answer

A)  21
B)  25
C)  42
D)  44
E)  46

Question 13

Of the three mechanisms leading to autopolyploidy,which is the most rare event?

Accepted Answer

multiple f...

Question 14

What does the model of hybrid dysgenesis predict for the F₁ and F₂ generations when an M-cytotype male is crossed to a P-cytotype female?

Accepted Answer

F₁ and F₂ will be wi...

Question 15

If an organism is an inversion heterozygote,

Accepted Answer

A)  homologous chromosomes align during meiosis through formation of an inversion loop at synapsis.
B)  homologous chromosomes align during meiosis through formation of a Holliday junction at synapsis.
C)  nonhomologous chromosomes pair during meiosis due to the translocation of genes between two different chromosomes.
D)  it will experience normal chromosome synapsis during meiosis.
E)  it will be unable to complete replication due to DNA damage,and the cell cycle will be arrested.

Question 16

What type of aneuploidy is responsible for Turner syndrome in humans?

Accepted Answer

A)  trisomy 13
B)  trisomy 18
C)  trisomy 21
D)  monosomy XO
E)  monosomy YO

Question 17

A partial chromosome deletion or duplication can be observed at prophase I homologous chromosome synapsis during meiosis by looking for what structure?

Accepted Answer

The answer of A partial chromosome deletion or duplication can...

Question 18

Cri-du-chat syndrome is a human disorder caused by which type of chromosomal defect?

Accepted Answer

The answer of Cri-du-chat syndrome is a human disorder caused...

Question 19

What does the model of hybrid dysgenesis predict for the F₁ and F₂ generations when a P-cytotype male is crossed to an M-cytotype female?

Accepted Answer

F₁ will be...

Question 20

What are the two common patterns of chromosome segregation seen in the tetravalent structures found in translocation heterozygotes?

Accepted Answer

alternate ...

Exam 13: Chromosome Aberrations and Transposition

What does the model of hybrid dysgenesis predict for the F₁ and F₂ generations when an M-cytotype male is crossed to a P-cytotype female?

Correct AnswerverifiedF₁ and F₂ will be wi...View AnswerShow Answer

What structure,seen during synapsis,is indicative of a chromosome inversion?

Correct AnswerverifiedShow Answer

What type of aneuploidy is responsible for Turner syndrome in humans?

Correct AnswerverifiedShow Answer

If an organism is an inversion heterozygote,

Correct AnswerverifiedShow Answer

What are the two common patterns of chromosome segregation seen in the tetravalent structures found in translocation heterozygotes?

Correct Answerverifiedalternate ...View AnswerShow Answer

Of the three mechanisms leading to autopolyploidy,which is the most rare event?

Correct Answerverifiedmultiple f...View AnswerShow Answer

A chromosome contains the following gene order: A B C D • E F G H Which of the following rearrangements represents a pericentric inversion?

Correct AnswerverifiedShow Answer

An organism with a genome size of n = 23 experienced a Robertsonian translocation.How many chromosomes would you expect to see in the karyotype of a somatic cell in an affected individual?

Correct AnswerverifiedShow Answer

Pseudodominance is used to map genes by using what method?

Correct AnswerverifiedShow Answer

In Drosophila and Lepidoptera,sex-chromosome mosaicism produces what type of sexually ambiguous phenotype?

Correct AnswerverifiedShow Answer

Humans with the condition of familial Down syndrome exhibit which type of chromosomal aberration?

Correct AnswerverifiedShow Answer

A partial chromosome deletion or duplication can be observed at prophase I homologous chromosome synapsis during meiosis by looking for what structure?

Correct AnswerverifiedShow Answer

What does the model of hybrid dysgenesis predict for the F₁ and F₂ generations when a P-cytotype male is crossed to an M-cytotype female?

Correct AnswerverifiedF₁ will be...View AnswerShow Answer

Cri-du-chat syndrome is a human disorder caused by which type of chromosomal defect?

Correct AnswerverifiedShow Answer

How is aneuploidy different from polyploidy? What are the mechanisms by which aneuploidy and polyploidy are caused,and what are the consequences of these chromosomal alterations in terms of survival and fertility of the offspring?

Correct AnswerverifiedAneuploidy occurs when one or more chrom...View AnswerShow Answer

Gametes produced by inversion heterozygotes can produce no viable recombinant chromosomes due to what phenomenon?

Correct Answerverifiedcrossover ...View AnswerShow Answer

What sequences or structures within the DNA can be used to identify sites of transposition?

Correct AnswerverifiedShow Answer

Of the various genetic elements described by McClintock,which one is classified as an autonomous transposable element?

Correct AnswerverifiedShow Answer

In an allopolyploid organism,what is true regarding the fertility of interspecies hybrids?

Correct AnswerverifiedShow Answer

In bacteria,what is contained within the IS elements?

Correct AnswerverifiedShow Answer

Correct Answer
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F₁ and F₂ will be wi...
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Correct Answer
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Correct Answer
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Correct Answer
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alternate ...
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multiple f...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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F₁ will be...
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Correct Answer
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Correct Answer
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Aneuploidy occurs when one or more chrom...
View Answer

Correct Answer
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crossover ...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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