Question 1

Organisms generally have many more genes that assort independently than the number of chromosomes.This phenomenon is due to

Accepted Answer

A)  independent assortment.
B)  segregation.
C)  crossing over.
D)  epistasis.
E)  pleiotropy.F) None of the above
G) C) and E)

Question 2

If a XY individual had a deletion of the SYR gene,they would

Accepted Answer

A)  develop as a female.
B)  have both male and female characteristics.
C)  have ambiguous genitalia.
D)  develop as a male.E) B) and C)
F) A) and D)

Question 3

If you needed to order genes on a chromosome,you would perform

Accepted Answer

A)  a test cross.
B)  a two-point cross.
C)  a three-point cross.
D)  a SNP test.E) A) and B)
F) None of the above

Question 4

The classic experiments performed by Creighton and McClintock in Maize

Accepted Answer

A)  provided the initial evidence for recombination.
B)  provided evidence for linkage between genes.
C)  allowed for the establishment of the first genetic map.
D)  provided evidence for the physical exchange of genetic material.E) None of the above
F) A) and D)

Question 5

Why is mitochondrial DNA not a unique identifier?

Accepted Answer

A)  Mitochondrial DNA is inherited through the paternal lineage.All offspring inherit their father's mitochondria,and therefore the same mitochondrial DNA.As a result,all family members that share a paternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a paternal line,but cannot be used to identify a specific individual.
B)  Mitochondrial DNA is inherited through the maternal lineage.All offspring inherit their mother's mitochondria,and therefore the same mitochondrial DNA.As a result,all family members that share a maternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line,but cannot be used to identify a specific individual.
C)  Mitochondrial DNA is inherited through the maternal lineage.All female offspring inherit their mother's mitochondria,and therefore the same mitochondrial DNA.As a result,all female family members that share a maternal lineage would have the same mitochondrial DNA.Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line,but cannot be used to identify a specific individual.D) None of the above
E) All of the above

Question 6

Which offspring will inherit all their mitochondria DNA from their mother and none from their father?

Accepted Answer

A)  daughters
B)  sons
C)  both sons and daughters
D)  Mitochondria DNA is inherited from both parentsE) A) and C)
F) B) and D)

Question 7

Nondisjunction of autosomes can lead to all of the following except

Accepted Answer

A)  aneuploidy.
B)  monosomy.
C)  trisomy.
D)  euploidy.E) A) and B)
F) All of the above

Question 8

The geneticist who discovered the white eye mutation in Drosophila and helped establish that genes are carried on chromosomes was

Accepted Answer

A)  Mendel.
B)  Sutton.
C)  Sturtevant.
D)  Janssens.
E)  Morgan.F) B) and E)
G) C) and E)

Question 9

Given that bw and hv are closely linked,which of the following genotypic ratios can you expect to find in the F2 generation?

Accepted Answer

A)  1:2:1
B)  1:1:1:1
C)  9:3:3:1
D)  3:1E) A) and B)
F) A) and C)

Question 10

In Drosophila,the sex of an individual is influenced by the number of copies of which chromosome?

Accepted Answer

A)  autosome
B)  X
C)  1
D)  2
E)  whiteF) A) and D)
G) B) and D)

Question 11

Over time,natural selection eliminates individuals with detrimental phenotypes from a population.However,there are several examples in the human population in which harmful genetic polymorphisms are maintained.Why?

Accepted Answer

A)  Individuals with two wild type alleles have advantages over individuals carrying the harmful allele.
B)  Individuals with two harmful alleles have advantages over individuals carrying one copy of the harmful allele.
C)  Homozygous individuals have some other advantage over individuals with two wild type alleles.
D)  Heterozygous individuals have some other advantage over individuals with two wild type alleles.E) All of the above
F) B) and C)

Question 12

Traits that are carried on the X chromosome are said to be _________________.

Accepted Answer

A)  autosomal
B)  gametal
C)  sex-linked
D)  allelesE) All of the above
F) A) and D)

Question 13

In humans,if a non-disjunction event led to an individual with a genotype of XXY,they would

Accepted Answer

A)  be female because they have two X chromosomes.
B)  be male because they have a Y chromosome.
C)  display both male and female characteristics.
D)  not survive.E) B) and C)
F) A) and D)

Question 14

In Drosophila,dosage compensation is controlled by the male-specific lethal (MSL) complex consisting of MSL proteins and roX RNAs.Based on what you know about dosage compensation,the role of the MSL complex would be to

Accepted Answer

A)  increase the level of expression on the X chromosome approximately 2 fold.
B)  increase the level of expression on the X chromosome approximately 50%.
C)  decrease the level of expression on the X chromosome approximately 2 fold.
D)  decrease the level of expression on the X chromosome approximately 50%.E) A) and B)
F) None of the above

Question 15

What would be the results of a test cross with the F1 flies?

Accepted Answer

A)  1 brown,thin: 1 red,heavy
B)  1 brown,heavy: 1 red,thin
C)  1 brown,thin: 2 red,thin: 1 red,heavy
D)  1 brown,heavy: 2 red,thin: 1 red,thinE) A) and B)
F) None of the above

Question 16

Sickle cell anemia is caused by a defect in the

Accepted Answer

A)  oxygen carrying pigment hemoglobin.
B)  protein makeup in the liver.
C)  sticky sides of the red blood cells.
D)  allele for the production of mucus in the lungs.E) A) and B)
F) A) and C)

Question 17

A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome,depending on

Accepted Answer

A)  the parental origin of the normal and deleted chromosome.
B)  whether or not the region is methylated properly.
C)  whether a translocation event has occurred.
D)  whether a nondisjunction event has occurreD.E) A) and D)
F) B) and D)

Question 18

The white eye mutation in Drosophila was shown to be sex-linked and caused by a gene residing on chromosome

Accepted Answer

A)  X.
B)  Y.
C)  1.
D)  2.
E)  autosomE.F) A) and C)
G) B) and E)

Question 19

A test cross can be used to do all of the following except

Accepted Answer

A)  determine whether an individual that displays a dominant phenotype is homozygous for the trait.
B)  determine whether an individual that displays a dominant phenotype is heterozygous for the trait.
C)  gather genotype information from phenotype information.
D)  identify the chromosome on which a gene is locateD.E) None of the above
F) B) and D)

Question 20

Occasionally,chromosomes fail to separate during meiosis,leading to a condition in which the diploid number is not normal.This phenomenon is called

Accepted Answer

A)  epistasis.
B)  nondisjunction.
C)  disjunction.
D)  pleiotropy.
E)  autosomy.F) B) and D)
G) All of the above

Exam 13: Chromosomes Mapping and the Meiosis - Inheritance Connection

Traits that are carried on the X chromosome are said to be _________________.

Correct AnswerverifiedShow Answer

If you needed to order genes on a chromosome,you would perform

Correct AnswerverifiedShow Answer

A test cross can be used to do all of the following except

Correct AnswerverifiedShow Answer

A deletion of a particular stretch of chromosome 15 can cause either Prader-Willi syndrome or Angelman syndrome,depending on

Correct AnswerverifiedShow Answer

The white eye mutation in Drosophila was shown to be sex-linked and caused by a gene residing on chromosome

Correct AnswerverifiedShow Answer

If a XY individual had a deletion of the SYR gene,they would

Correct AnswerverifiedShow Answer

Why is mitochondrial DNA not a unique identifier?

Correct AnswerverifiedShow Answer

The classic experiments performed by Creighton and McClintock in Maize

Correct AnswerverifiedShow Answer

In Drosophila,the sex of an individual is influenced by the number of copies of which chromosome?

Correct AnswerverifiedShow Answer

The geneticist who discovered the white eye mutation in Drosophila and helped establish that genes are carried on chromosomes was

Correct AnswerverifiedShow Answer

Nondisjunction of autosomes can lead to all of the following except

Correct AnswerverifiedShow Answer

In Drosophila,dosage compensation is controlled by the male-specific lethal (MSL) complex consisting of MSL proteins and roX RNAs.Based on what you know about dosage compensation,the role of the MSL complex would be to

Correct AnswerverifiedShow Answer

Given that bw and hv are closely linked,which of the following genotypic ratios can you expect to find in the F2 generation?

Correct AnswerverifiedShow Answer

What would be the results of a test cross with the F1 flies?

Correct AnswerverifiedShow Answer

In humans,if a non-disjunction event led to an individual with a genotype of XXY,they would

Correct AnswerverifiedShow Answer

Over time,natural selection eliminates individuals with detrimental phenotypes from a population.However,there are several examples in the human population in which harmful genetic polymorphisms are maintained.Why?

Correct AnswerverifiedShow Answer

Which offspring will inherit all their mitochondria DNA from their mother and none from their father?

Correct AnswerverifiedShow Answer

Occasionally,chromosomes fail to separate during meiosis,leading to a condition in which the diploid number is not normal.This phenomenon is called

Correct AnswerverifiedShow Answer

Sickle cell anemia is caused by a defect in the

Correct AnswerverifiedShow Answer

Organisms generally have many more genes that assort independently than the number of chromosomes.This phenomenon is due to

Correct AnswerverifiedShow Answer

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Given that bw and hv are closely linked,which of the following genotypic ratios can you expect to find in the F₂ generation?

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What would be the results of a test cross with the F₁ flies?

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