Question 1

Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo's cell would have how many homologous pairs?

Accepted Answer

A)   16
B)   32
C)   64
D)   80
E)   128F) A) and C)
G) B) and D)

Question 2

During meiosis II,

Accepted Answer

A)   homologous chromosomes line up separately, with sister chromatids facing the same spindle pole.
B)   chromosomes line up separately, with sister chromatids facing opposite spindle poles.
C)   chromosomes line up separately, with sister chromatids facing the same spindle pole.
D)   homologous chromosomes line up separately, with sister chromatids facing opposite spindle poles.
E)   homologous chromosomes line up together, with sister chromatids facing opposite spindle poles.F) A) and B)
G) C) and D)

Question 3

During which stage of meiosis will the pairs of homologous chromosomes line up?

Accepted Answer

A)   metaphase I
B)   metaphase II
C)   metaphase
D)   anaphase I
E)   prophase IIF) None of the above
G) A) and D)

Question 4

Metaphase II is more similar to metaphase of mitosis than to metaphase I because

Accepted Answer

A)   in metaphase I, tetrads align together at the spindle equator.
B)   in metaphase II, tetrads align separately at the spindle equator.
C)   in metaphase of mitosis, tetrads align separately at the spindle equator.
D)   in metaphase II, chromosomes align separately at the spindle equator.
E)   in metaphase I, chromosomes align separately at the spindle equator.F) A) and B)
G) A) and D)

Question 5

In the human life cycle,

Accepted Answer

A)   meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.
B)   mitosis produces haploid gametes, and fertilization creates a diploid cell that divides by meiosis to produce a new individual.
C)   diploid gametes are produced by meiosis, and fertilization produces haploid daughter cells that divide by mitosis to produce a new individual.
D)   diploid gametes are produced by mitosis, and fertilization results in tetrapolid daughter cells that divide by meiosis to produce a new individual.
E)   a haploid zygote is produced by meiosis and fertilization results in a diploid daughter cells that divide by mitosis to produce a new individual.F) All of the above
G) B) and C)

Question 6

The human life cycle consists of

Accepted Answer

A)   adults who are haploid and produce diploid gametes; these gametes fuse to produce a haploid zygote which grows into an adult.
B)   zygotes who are haploid fuse to produce a diploid gamete which grows into an adult.
C)   gametes that are diploid and produce haploid zygotes; these grow into haploid adults.
D)   adults who are diploid and produce haploid gametes; these gametes fuse to produce a diploid zygote which grows into an adult.
E)   adults that are diploid who produce zygotes that are also diploid.F) A) and E)
G) B) and C)

Question 7

Crossing-over between sister chromatids does not result in recombination of genetic material, while crossing-over between nonsister chromatids does because

Accepted Answer

A)   sister chromatids have the same alleles, while nonsister chromatids have different ones.
B)   sister chromatids have the same genes, while nonsister chromatids have different ones.
C)   sister chromatids have the same alleles but different genes, while nonsister chromatids have different alleles but the same genes.
D)   nonsister chromatids have the same alleles, while sister chromatids have different ones.
E)   nonsister chromatids have the same genes, while sister chromatids have different ones.F) A) and B)
G) D) and E)

Question 8

A human egg with 22 chromosomes that is fertilized by a normal sperm will result in

Accepted Answer

A)   a zygote with trisomy.
B)   a zygote with disomy.
C)   a zygote with monosomy.
D)   a zygote with a normal chromosome number.
E)   a fertilized egg with 44 chromosomes.F) B) and E)
G) A) and E)

Question 9

Which of the following statements is correct?

Accepted Answer

A)   Meiosis involves two divisions and produces four nonidentical gametes.
B)   Meiosis involves one division and produces two nonidentical gametes.
C)   Mitosis involves one division and produces two nonidentical gametes.
D)   Mitosis involves two divisions and produces four identical gametes.
E)   Meiosis involves two divisions and produces four identical gametes.F) B) and C)
G) A) and B)

Question 10

The chances of a woman over 40 years old having a baby with Down Syndrome is

Accepted Answer

A)   1 in 800.
B)   1 in 400.
C)   1 in 40.
D)   1 in 80.
E)   1 in 21.F) A) and D)
G) C) and E)

Question 11

Which of the following phases results in separation of sister chromatids into daughter chromosomes?

Accepted Answer

A)   anaphase of mitosis only
B)   anaphase I, anaphase II, and anaphase of mitosis
C)   anaphase I and anaphase II
D)   anaphase I and anaphase of mitosis
E)   anaphase II and anaphase of mitosisF) B) and E)
G) B) and C)

Question 12

Which of the following is a characteristic of someone with Down syndrome?

Accepted Answer

A)   short stature
B)   eyelid fold
C)   stubby fingers
D)   fissured tongue
E)   All of the above answers describe characteristics of someone with Down syndrome.F) A) and E)
G) B) and C)

Question 13

Which of the following is an inaccurate statement about crossing-over?

Accepted Answer

A)   Crossing-over is preceded by a process known as synapsis, where homologous chromosomes attach to each other.
B)   Crossing-over results in greater genetic variability in offspring.
C)   Crossing-over occurs between sister chromatids.
D)   Crossing-over occurs during prophase I when homologous chromosomes line up prior to separation.
E)   In humans, crossing-over results in genetic recombination.F) C) and D)
G) A) and B)

Question 14

During prophase II, a cell contains how many copies of each gene?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   8F) A) and E)
G) A) and D)

Question 15

Which statement best describes how homologous chromosomes are separated during meiosis I?

Accepted Answer

A)   The two homologous chromosomes separate into two different daughter cells.
B)   The sister chromatids of each chromosome separate into different daughter cells.
C)   The nonsister chromatids of each homologous pairs separate into different daughter cells.
D)   The two homologous chromosomes travel together into one new daughter cell.
E)   The two homologous chromosomes are not separated during meiosis I.F) All of the above
G) A) and B)

Question 16

Which pair of chromosomes on a karyotype would show you the sex of a baby?

Accepted Answer

A)   21st pair
B)   18th pair
C)   23rd pair
D)   6th pair
E)   1st pairF) B) and E)
G) A) and D)

Question 17

Which of the following is a correct match?

Accepted Answer

A)   separation of tetrads - anaphase II
B)   synapsis - metaphase I
C)   separation of sister chromatids - anaphase I
D)   synapsis - prophase II
E)   separation of sister chromatids - anaphase IIF) A) and B)
G) A) and C)

Question 18

The failure of sister chromatids to separate during meiosis is called

Accepted Answer

A)   synapsis.
B)   crossing-over.
C)   tetrad formation.
D)   disjunction.
E)   nondisjunction.F) A) and B)
G) A) and C)

Question 19

One of the main goals of meiosis is

Accepted Answer

A)   create cells that are genetically identical to their parent cell.
B)   to create a fertilized egg that has half the genetic material of the parents.
C)   to reduce the number of chromosomes by half in gametes.
D)   to prevent genetic disorders.
E)   to reduce genetic diversity.F) C) and D)
G) B) and D)

Question 20

During prophase I, a diploid organism contains how many copies of each gene?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   8F) B) and D)
G) A) and B)

Exam 9: Meiosis and the Genetic Basis of Sexual Reproduction

Crossing-over between sister chromatids does not result in recombination of genetic material, while crossing-over between nonsister chromatids does because

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Which of the following statements is correct?

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The human life cycle consists of

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Metaphase II is more similar to metaphase of mitosis than to metaphase I because

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During which stage of meiosis will the pairs of homologous chromosomes line up?

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A human egg with 22 chromosomes that is fertilized by a normal sperm will result in

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During prophase II, a cell contains how many copies of each gene?

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Which of the following is an inaccurate statement about crossing-over?

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Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo's cell would have how many homologous pairs?

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The chances of a woman over 40 years old having a baby with Down Syndrome is

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In the human life cycle,

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Which pair of chromosomes on a karyotype would show you the sex of a baby?

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Which of the following phases results in separation of sister chromatids into daughter chromosomes?

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Which of the following is a characteristic of someone with Down syndrome?

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One of the main goals of meiosis is

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Which statement best describes how homologous chromosomes are separated during meiosis I?

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During prophase I, a diploid organism contains how many copies of each gene?

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Which of the following is a correct match?

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During meiosis II,

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The failure of sister chromatids to separate during meiosis is called

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