Question 1

During the pairing of homologs in prophase of meiosis I, the region of a normal, nondeleted chromosome that has nothing with which to recombine forms a

Accepted Answer

A)  inversion loop.
B)  deletion heterozygote.
C)  crossover suppressor.
D)  deletion loop.E) All of the above
F) A) and C)

Question 2

Despite selection against chromosomal variations

Accepted Answer

A)  related species almost always have the same karyotype.
B)  related species almost always have a different karyotype.
C)  closely related species diverge by many chromosomal rearrangements.
D)  distantly related species diverge by only a few chromosomal rearrangements.E) B) and C)
F) A) and B)

Question 3

During mitosis, if all of the chromosomes in a diploid tissue fail to separate during anaphase one daughter cell will be

Accepted Answer

A)  monoploid.
B)  tetrasomic.
C)  triploid.
D)  tetraploid.E) B) and C)
F) A) and D)

Question 4

Which of the following is not an example of an aneuploidy?

Accepted Answer

A)  monosomy
B)  tetraploid
C)  trisomy
D)  tetrasomyE) B) and C)
F) All of the above

Question 5

Any DNA segment that moves about in the genome

Accepted Answer

The answer of Any DNA segment that moves about in...

Question 6

The condition of semisterility is most closely associated with

Accepted Answer

A)  chromosomal duplications.
B)  pericentric inversions.
C)  translocation heterozygotes.
D)  translocation homozygotes.E) A) and B)
F) B) and C)

Question 7

Duplications can be created by

Accepted Answer

A)  chromosomal breakage and normal repair.
B)  equal crossing over.
C)  errors in replication.
D)  single point mutationsE) All of the above
F) B) and C)

Question 8

In Drosophila, a gynandromorph, which is composed of equal parts of male and female tissue, results from

Accepted Answer

A)  an XX female losing one X chromosome during the first mitotic division after fertilization.
B)  an egg carrying an X chromosome fertilized by a Y-carrying sperm.
C)  a normal egg fertilized by both an X-carrying sperm and a Y-carrying sperm.
D)  the fusion of a female embryo with a male embryo.E) A) and B)
F) A) and D)

Question 9

Which of the following molecular techniques could a scientist use to help locate genes on cloned fragments of DNA with deletion mutants?

Accepted Answer

A)  in situ hybridization and cross over analysis
B)  crossover and Southern blot analysis
C)  Southern blot , crossover analysis and in situ hybridization
D)  in situ hybridization and Southern blot analysisE) C) and D)
F) All of the above

Question 10

During the pairing of homologs in prophase of meiosis I, the region of a chromosome bearing extra copies of a particular chromosomal region that has nothing with which to recombine with forms a

Accepted Answer

A)  inversion loop.
B)  deletion heterozygote.
C)  duplication loop.
D)  deletion loop.E) All of the above
F) A) and D)

Question 11

A piece of genetic material that moves from place to place in the genome

Accepted Answer

The answer of A piece of genetic material that moves...

Question 12

Of the following segregation patterns for chromosomes that have undergone reciprocal translocation, which one is most likely to result in a normal zygote?

Accepted Answer

A)  alternate
B)  adjacent-1
C)  adjacent-2
D)  nondisjunctionE) A) and D)
F) A) and C)

Question 13

The type of chromosomal rearrangement that reorganizes the DNA sequence within one chromosome is known as a(n)

Accepted Answer

A)  inversion.
B)  duplication.
C)  deletion.
D)  translocation.E) A) and D)
F) A) and C)

Question 14

Which of the following is not an example of a euploid condition?

Accepted Answer

A)  triploidy
B)  diploidy
C)  trisomy 21
D)  tetraploidyE) C) and D)
F) B) and C)

Question 15

Barbara McClintock is most closely associated with which of the following?

Accepted Answer

A)  the initial discovery of genetic transposition
B)  the discovery of transposable elements in corn
C)  the mutation rate in translocation heterozygotes
D)  the demonstration of the presence of transposable elements in polytene chromosomesE) A) and B)
F) A) and C)

Question 16

In general, which type of mutation usually has the greatest probability of lethality?

Accepted Answer

A)  inversion
B)  duplication
C)  deletion
D)  translocationE) A) and B)
F) A) and C)

Question 17

Which is not a typical characteristic of transposable elements?

Accepted Answer

A)  typically smaller than 50 bp
B)  may be present in a genome from one to thousands of times
C)  found only in a select group of organisms
D)  need not be sequences that do something for the organismE) None of the above
F) B) and C)

Question 18

Which of the following sex chromosome aneuploidies is not usually seen in live births?

Accepted Answer

A)  XO
B)  XXY
C)  YO
D)  XXXE) B) and C)
F) A) and D)

Question 19

A type of rearrangement that results in a loss of genetic material from the genome

Accepted Answer

The answer of A type of rearrangement that results in...

Question 20

Triploid organisms usually result from

Accepted Answer

A)  the union of haploid and diploid gametes.
B)  unequal disjunction during embryogenesis.
C)  propagation of fused cell lines.
D)  fusion of three gametes simultaneously.E) None of the above
F) A) and C)

Exam 12: Chromosomal Rearrangements and Changes in Chromosome Number

Any DNA segment that moves about in the genome

Correct AnswerverifiedShow Answer

Which of the following is not an example of a euploid condition?

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Of the following segregation patterns for chromosomes that have undergone reciprocal translocation, which one is most likely to result in a normal zygote?

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Which is not a typical characteristic of transposable elements?

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Which of the following molecular techniques could a scientist use to help locate genes on cloned fragments of DNA with deletion mutants?

Correct AnswerverifiedShow Answer

The type of chromosomal rearrangement that reorganizes the DNA sequence within one chromosome is known as a(n)

Correct AnswerverifiedShow Answer

Barbara McClintock is most closely associated with which of the following?

Correct AnswerverifiedShow Answer

Duplications can be created by

Correct AnswerverifiedShow Answer

A type of rearrangement that results in a loss of genetic material from the genome

Correct AnswerverifiedShow Answer

In Drosophila, a gynandromorph, which is composed of equal parts of male and female tissue, results from

Correct AnswerverifiedShow Answer

Which of the following sex chromosome aneuploidies is not usually seen in live births?

Correct AnswerverifiedShow Answer

During mitosis, if all of the chromosomes in a diploid tissue fail to separate during anaphase one daughter cell will be

Correct AnswerverifiedShow Answer

During the pairing of homologs in prophase of meiosis I, the region of a normal, nondeleted chromosome that has nothing with which to recombine forms a

Correct AnswerverifiedShow Answer

Triploid organisms usually result from

Correct AnswerverifiedShow Answer

Which of the following is not an example of an aneuploidy?

Correct AnswerverifiedShow Answer

Despite selection against chromosomal variations

Correct AnswerverifiedShow Answer

The condition of semisterility is most closely associated with

Correct AnswerverifiedShow Answer

During the pairing of homologs in prophase of meiosis I, the region of a chromosome bearing extra copies of a particular chromosomal region that has nothing with which to recombine with forms a

Correct AnswerverifiedShow Answer

A piece of genetic material that moves from place to place in the genome

Correct AnswerverifiedShow Answer

In general, which type of mutation usually has the greatest probability of lethality?

Correct AnswerverifiedShow Answer

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