Question 1

When the phenotype of a heterozygote is intermediate between the phenotypes of its homozygous parents, the condition is known as:

Accepted Answer

A)  pleiotropy.
B)  aneuploidy.
C)  epistasis.
D)  polygenic inheritance.
E)  incomplete dominance.F) B) and E)
G) B) and D)

Question 2

The pairing of homologous chromosomes is called:

Accepted Answer

A)  synapsis.
B)  chiasma.
C)  crossing-over.
D)  recombination.
E)  bivalence.F) A) and B)
G) A) and E)

Question 3

In peas, the dominant alleles A and B must be present for purple flower pigment to be produced; otherwise the flowers are white.What offspring would you expect from a cross between plants of genotypes Aabb and aaBb?

Accepted Answer

A)  one purple: three white
B)  three purple: one white
C)  one purple: one white
D)  nine purple: two white
E)  two purple: three whiteF) C) and E)
G) All of the above

Question 4

Which of the following is true of Mendel's second law but not his first law?

Accepted Answer

A)  The two alleles of a gene assort independently of the alleles of the other genes.
B)  The two alleles of a gene separate from each other during the formation of gametes.
C)  A plant heterozygous for a trait forms more gametes than a plant homozygous for that trait.
D)  A plant homozygous for a trait forms more gametes than a plant heterozygous for that trait.
E)  Alleles occupy the same locus on homologous chromosomes.F) A) and D)
G) B) and C)

Question 5

A linkage map provides the approximate positions of the genes on a chromosome.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements about alleles is FALSE?

Accepted Answer

A)  They are different forms of the same gene.
B)  Interactions between alleles determine the characteristics of diploid organisms.
C)  They occupy different sites on homologous chromosomes.
D)  The site of an allele is called its locus.
E)  Dominant alleles are represented by uppercase letters, recessive alleles by lowercase letters.F) B) and D)
G) C) and E)

Question 7

The exchange of segments between nonhomologous chromosomes is called a(n) :

Accepted Answer

A)  deletion.
B)  inversion.
C)  duplication.
D)  translocation.
E)  point mutation.F) A) and B)
G) All of the above

Question 8

Which of the following statements about sexual reproduction is FALSE?

Accepted Answer

A)  It occurs only in eukaryotic organisms.
B)  It is necessary for the survival of the population.
C)  It involves a regular alternation between meiosis and fertilization.
D)  It produces and maintains an infinite array of genetic diversity in populations.
E)  It provides the basic mechanism of evolution.F) A) and E)
G) A) and B)

Question 9

A nucleosome is composed of histone proteins wrapped around a DNA filament.

Accepted Answer

A) True 
 B)False

Question 10

The seeds of all the progeny of a cross between yellow-seeded plants and green-seeded plants are as yellow as those of the yellow-seeded parent.From this information, it is clear that:

Accepted Answer

A)  this is an example of a dihybrid cross.
B)  the F1 generation consists entirely of yellow-seeded plants.
C)  the F2 generation consists entirely of yellow-seeded plants.
D)  green is a dominant characteristic.
E)  yellow is a recessive characteristic.F) C) and E)
G) B) and C)

Question 11

Which of the following statements about homologous chromosomes is FALSE?

Accepted Answer

A)  Both homologs are present in a zygote.
B)  One homolog comes from one parent and the other homolog from the other parent.
C)  Homologs resemble each other in the kinds of hereditary information they contain.
D)  Homologs resemble each other in size but not in shape.
E)  Homologs constitute a member of a pair.F) A) and B)
G) C) and D)

Question 12

Nuclear envelopes form around single-stranded chromosomes during:

Accepted Answer

A)  telophase II.
B)  metaphase I.
C)  prophase I.
D)  telophase I.
E)  metaphase II.F) A) and B)
G) B) and E)

Question 13

Which of the following is NOT a possible cause of maternal inheritance?

Accepted Answer

A)  The generative cell receives neither plastids nor mitochondria from the microspore.
B)  The generative cell receives plastids and mitochondria but they degenerate.
C)  Plastids and mitochondria are excluded from generative and sperm cells.
D)  Plastids and mitochondria are present in sperm cells but are not transmitted into the egg.
E)  Plastids and mitochondria are present in sperm cells but only plastids are transmitted into the egg.F) None of the above
G) C) and E)

Question 14

Which of the following statements concerning histones is FALSE?

Accepted Answer

A)  They are responsible for the folding of DNA.
B)  They are present in four distinct types.
C)  They are always present in chromatin.
D)  They are synthesized during the S phase of the cell cycle.
E)  They are positively charged.F) A) and E)
G) B) and E)

Question 15

Which of the following statements about transposons is FALSE?

Accepted Answer

A)  They are also called "jumping genes."
B)  They are movable genetic elements.
C)  They may lead to mutation.
D)  Plasmids can function as transposons.
E)  They occur only in bacteria.F) A) and B)
G) A) and C)

Question 16

If a cell has three pairs of homologous chromosomes, in how many ways could they be distributed among the haploid cells produced by meiosis?

Accepted Answer

A)  two
B)  three
C)  four
D)  eight
E)  nineF) A) and B)
G) B) and C)

Question 17

A translocation occurs when parts of two nonhomologous chromosomes are exchanged.

Accepted Answer

A) True 
 B)False

Question 18

Cytoplasmic inheritance in plants involves genes present in the:

Accepted Answer

A)  cytosol only.
B)  plastids only.
C)  mitochondria only.
D)  cytosol and plastids.
E)  mitochondria and plastids.F) B) and C)
G) A) and B)

Question 19

In ______, a single gene has many different effects on the phenotype.

Accepted Answer

A)  pleiotropy
B)  continuous variation
C)  epistasis
D)  polygenic inheritance
E)  incomplete dominanceF) All of the above
G) B) and E)

Question 20

Suppose that a plant has two genes that are linked, with Ab on one homolog of a homologous pair of chromosomes and aB on the other homolog.What gametes could the plant produce if crossing-over occurred between these genes during meiosis?

Accepted Answer

A)  Ab and aB only
B)  AB and ab only
C)  Aa and Bb only
D)  Ab, aB, AB, and ab only
E)  Ab, aB, AB, ab, Aa, and Bb onlyF) A) and C)
G) D) and E)

Exam 8: Sexual Reproduction and Heredity

Which of the following statements about homologous chromosomes is FALSE?

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The exchange of segments between nonhomologous chromosomes is called a(n) :

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Nuclear envelopes form around single-stranded chromosomes during:

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Which of the following statements about sexual reproduction is FALSE?

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A linkage map provides the approximate positions of the genes on a chromosome.

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When the phenotype of a heterozygote is intermediate between the phenotypes of its homozygous parents, the condition is known as:

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Which of the following statements about alleles is FALSE?

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Which of the following is true of Mendel's second law but not his first law?

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If a cell has three pairs of homologous chromosomes, in how many ways could they be distributed among the haploid cells produced by meiosis?

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Suppose that a plant has two genes that are linked, with Ab on one homolog of a homologous pair of chromosomes and aB on the other homolog.What gametes could the plant produce if crossing-over occurred between these genes during meiosis?

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A nucleosome is composed of histone proteins wrapped around a DNA filament.

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A translocation occurs when parts of two nonhomologous chromosomes are exchanged.

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The seeds of all the progeny of a cross between yellow-seeded plants and green-seeded plants are as yellow as those of the yellow-seeded parent.From this information, it is clear that:

Correct AnswerverifiedShow Answer

Which of the following statements concerning histones is FALSE?

Correct AnswerverifiedShow Answer

In peas, the dominant alleles A and B must be present for purple flower pigment to be produced; otherwise the flowers are white.What offspring would you expect from a cross between plants of genotypes Aabb and aaBb?

Correct AnswerverifiedShow Answer

Which of the following is NOT a possible cause of maternal inheritance?

Correct AnswerverifiedShow Answer

Cytoplasmic inheritance in plants involves genes present in the:

Correct AnswerverifiedShow Answer

In ______, a single gene has many different effects on the phenotype.

Correct AnswerverifiedShow Answer

The pairing of homologous chromosomes is called:

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Which of the following statements about transposons is FALSE?

Correct AnswerverifiedShow Answer

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