Question 1

A piece of DNA that can use transposase to move from one place in the genome to another is known as a(n)

Accepted Answer

A)  regulatory region
B)  duplication.
C)  translocation.
D)  transposable element.

Question 2

In terms of evolution, what might be the outcome of repeated duplications of one or a few genes in a species' genome?

Accepted Answer

A)  tetraploidy
B)  semisterility
C)  gene families
D)  create repetitive DNA that is of no use to the cell.

Question 3

What are the four major classes of chromosomal rearrangements?

Accepted Answer

A)  Inversions, duplications, translocations, deletions
B)  Duplications, reciprocal translocations, non-reciprocal translocations, inversions
C)  Deletions, inversions, duplications, reciprocal translocations
D)  Translocations, pericentric inversions, paracentric inversions, deletions

Question 4

What is NOT a mechanism by which transposon mobilization may be controlled by the cell?

Accepted Answer

A)  Transcriptional control of the transposon genes
B)  Translational control of transposon transcripts
C)  Increased degradation of retrotransposon intermediates
D)  Alternative splicing of a transposon transcript

Question 5

Hybrids in which the chromosome sets come from two distinct, though related, species are known as

Accepted Answer

A)  autopolyploids.
B)  allopolyploids.
C)  amphiploids.
D)  bivalents.

Question 6

Monoploids are useful in plant breeding because

Accepted Answer

A)  they can be grown into mature plants with desirable recessive traits.
B)  none of the embryoids will have deleterious traits
C)  they make it easier to create polyploid plants.
D)  they are typically resistant to commercial herbicides.

Question 7

One major difference between DNA and retrotransposons is that

Accepted Answer

A)  During transposition retrotransposons go through an RNA form that is copied back into DNA
B)  During transposition DNA transposons go through an RNA form that is copied back into DNA
C)  In humans DNA transposons are the only type of transposons that move
D)  DNA transposons are bordered by poly-A tracts

Question 8

Moves in the genome with the aid of an RNA intermediate

Accepted Answer

The answer of Moves in the genome with the aid...

Question 9

Which of the following do translocations and inversions not have in common?

Accepted Answer

A)  don't alter the amount of DNA in the genome
B)  ability to alter gene function
C)  use of inversion loops during crossing over
D)  catalysts of speciation

Question 10

Turner syndrome, XO, is a sex chromosome aneuploidy.Of the effects listed below, which one is not usually seen in this syndrome?

Accepted Answer

A)  unusually short stature
B)  infertility
C)  skeletal abnormalities
D)  unusually long limbs

Question 11

FISH analysis would least likely be used to detect

Accepted Answer

A)  translocations.
B)  duplications.
C)  deletions.
D)  point mutations.

Question 12

Karyotypes generally remain constant within a species because

Accepted Answer

A)  rearrangements occur frequently.
B)  changes in chromosome number occur infrequently.
C)  genetic instabilities produced by genomic changes usually are at a selective disadvantage.
D)  genetic imbalances are often at a selective advantage.

Question 13

An acentric fragment can be the result of crossing over between a normal chromosome and a chromosome that has undergone what kind of mutation?

Accepted Answer

A)  paracentric inversion
B)  duplication
C)  translocation
D)  pericentric inversion

Question 14

For an organism to survive a deletion of more than a few genes, it must carry a nondeleted homolog of the deleted chromosome.This organism is known as

Accepted Answer

A)  a deletion heterozygote.
B)  a deletion homozygote.
C)  dosage compensation.
D)  a triplolethal chromosome.

Question 15

Deletions can be useful for mapping

Accepted Answer

A)  when the other allele is recessive that results in a viable but detectable phenotype
B)  when the other allele is dominant.
C)  if the other allele results in no detectable phenotype.
D)  only when the individual has both alleles deleted.

Question 16

An example in humans of a disease or syndrome that can occur at higher frequency when a deleted copy of a gene is inherited is

Accepted Answer

A)  triplolethal.
B)  scarlet eyes.
C)  retinoblastoma.
D)  cataracts.

Question 17

An enzyme that catalyzes a transposition event

Accepted Answer

The answer of An enzyme that catalyzes a transposition event...

Question 18

What types of mutations adds material to the genome?

Accepted Answer

A)  inversions
B)  duplications
C)  deletions
D)  translocations

Question 19

Inversions may be difficult to detect because they

Accepted Answer

A)  never visibly change chromosome banding patterns.
B)  increase recombination in heterozygotes.
C)  do not usually cause an abnormal phenotype.
D)  normally are removed immediately in natural populations.

Question 20

In terms of evolution, what might be the results of transposable elements in a species' genome?

Accepted Answer

A)  novel mutations, some of which may be beneficial
B)  transposons do not have any role in evolution
C)  generation of potentially detrimental inversions
D)  increase the point mutation rate of cells

Exam 12: Chromosomal Rearrangements and Changes in Chromosome Number

A piece of DNA that can use transposase to move from one place in the genome to another is known as a(n)

Correct AnswerverifiedShow Answer

What are the four major classes of chromosomal rearrangements?

Correct AnswerverifiedShow Answer

Inversions may be difficult to detect because they

Correct AnswerverifiedShow Answer

An example in humans of a disease or syndrome that can occur at higher frequency when a deleted copy of a gene is inherited is

Correct AnswerverifiedShow Answer

One major difference between DNA and retrotransposons is that

Correct AnswerverifiedShow Answer

FISH analysis would least likely be used to detect

Correct AnswerverifiedShow Answer

What is NOT a mechanism by which transposon mobilization may be controlled by the cell?

Correct AnswerverifiedShow Answer

Moves in the genome with the aid of an RNA intermediate

Correct AnswerverifiedShow Answer

Karyotypes generally remain constant within a species because

Correct AnswerverifiedShow Answer

In terms of evolution, what might be the outcome of repeated duplications of one or a few genes in a species' genome?

Correct AnswerverifiedShow Answer

An acentric fragment can be the result of crossing over between a normal chromosome and a chromosome that has undergone what kind of mutation?

Correct AnswerverifiedShow Answer

Monoploids are useful in plant breeding because

Correct AnswerverifiedShow Answer

Which of the following do translocations and inversions not have in common?

Correct AnswerverifiedShow Answer

Hybrids in which the chromosome sets come from two distinct, though related, species are known as

Correct AnswerverifiedShow Answer

Deletions can be useful for mapping

Correct AnswerverifiedShow Answer

Turner syndrome, XO, is a sex chromosome aneuploidy.Of the effects listed below, which one is not usually seen in this syndrome?

Correct AnswerverifiedShow Answer

In terms of evolution, what might be the results of transposable elements in a species' genome?

Correct AnswerverifiedShow Answer

For an organism to survive a deletion of more than a few genes, it must carry a nondeleted homolog of the deleted chromosome.This organism is known as

Correct AnswerverifiedShow Answer

An enzyme that catalyzes a transposition event

Correct AnswerverifiedShow Answer

What types of mutations adds material to the genome?

Correct AnswerverifiedShow Answer

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