Question 1

An individual with the karyotype 48, XYYY would have how many Barr bodies?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4

Question 2

Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo's cell would have ____ tetrads present.

Accepted Answer

A)   16
B)   32
C)   64
D)   80
E)   128

Question 3

A tetrad is composed of

Accepted Answer

A)   two chromosomes with two sister chromatids each.
B)   two sister chromatids with separate centromeres.
C)   four chromosomes with two sister chromatids each.
D)   four sister chromatids with a common centromere.
E)   four sister chromatids attached at a common centromere.

Question 4

Figure: 
-Which of the diagrams represents a chromosome pair in a cell at the end of prophase II?

Accepted Answer

A)   diagram 1
B)   diagram 2
C)   diagram 3
D)   diagram 4
E)   diagram 5

Question 5

The possibility of Down syndrome increases as the mother's age increases because

Accepted Answer

A)   her DNA is damaged through an accumulation of replication errors.
B)   her DNA stops checking for replication errors.
C)   fertilization no longer occurs correctly with older eggs.
D)   the contents of the egg contains the wrong signals for the correct development of the fetus.
E)   the possibility of nondisjunction increases.

Question 6

Which of the following does not occur twice during meiosis?

Accepted Answer

A)   production of daughter nuclei
B)   spindle formation
C)   pairing of homologous chromosomes
D)   separation of genetic material
E)   alignment of chromosomes at spindle equator

Question 7

An 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 normal chromosome number.
E)   nondisjunction during subsequent mitosis.

Question 8

Klinefelter syndrome can result from

Accepted Answer

A)   nondisjunction during meiosis I in the female parent.
B)   nondisjunction during meiosis I in the male parent.
C)   nondisjunction during meiosis I in either female parent.
D)   nondisjunction during meiosis I or II in the male parent.
E)   nondisjunction during meiosis I or II in either parent.

Question 9

During G1 stage of interphase, a diploid organism contains how many copies of each gene?

Accepted Answer

A)   1
B)   2
C)   4
D)   8
E)   16

Question 10

For the figure shown here, indicate the correct stage of meiosis and diploid chromosome number.

Accepted Answer

A)   metaphase II, 2n=4
B)   metaphase II, 2n=2
C)   metaphase II, 2n=8
D)   metaphase I, 2n=4
E)   metaphase I, 2n=8

Question 11

Which statement best describes how the members of a tetrad are separated during meiosis I?

Accepted Answer

A)   The two homologous chromosomes of a tetrad separate into different daughter nuclei.
B)   The sister chromatids of each chromosome separate into different daughter nuclei.
C)   The nonsister chromatids of each tetrad separate into different daughter nuclei.
D)   The two homologous chromosomes of a tetrad separate into one of two daughter nuclei.
E)   The two homologous chromosomes of a tetrad are duplicated and separate into each daughter nucleus.

Question 12

The failure of sister chromatids to separate would result in how many normal gametes?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4

Question 13

Turner syndrome is associated with which of the following karyotypes?

Accepted Answer

A)   47, XXY
B)   47, XXX
C)   46, XY
D)   47, XY, trisomy 21
E)   45, XO

Question 14

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

Accepted Answer

A)   sister chromatids have the same alleles while non-sister chromatids have different ones.
B)   sister chromatids have the same genes while non-sister chromatids have different ones.
C)   sister chromatids have the same alleles but different genes while non-sister chromatids have different alleles but the same genes.
D)   non-sister chromatids have the same alleles while sister chromatids have different ones.
E)   non-sister chromatids have the same genes while sister chromatids have different ones.

Question 15

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

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   8

Question 16

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, dyads align separately at the spindle equator.
E)   in metaphase I, dyads align separately at the spindle equator.

Question 17

Which of the following lists is in the correct order, from the least inclusive to the most inclusive?

Accepted Answer

A)   allele - gene - chromosome
B)   gene - allele - chromosome
C)   allele - chromosome - gene
D)   chromosome - gene - allele
E)   gene - chromosome - allele

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.

Question 19

During crossing-over,

Accepted Answer

A)   genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.
B)   genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles.
C)   sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.
D)   nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.
E)   one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles.

Question 20

During meiosis I, the homologous chromosomes of a tetrad

Accepted Answer

A)   face the same spindle pole.
B)   face both spindle poles.
C)   face opposite spindle poles.
D)   do not face spindle poles, but are aligned at the spindle equator.
E)   undergo separation of sister chromatids.

Exam 9: Sexual Reproduction

During crossing-over,

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During G1 stage of interphase, a diploid organism contains how many copies of each gene?

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Turner syndrome is associated with which of the following karyotypes?

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Klinefelter syndrome can result from

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Which of the following lists is in the correct order, from the least inclusive to the most inclusive?

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

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During meiosis I, the homologous chromosomes of a tetrad

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Which statement best describes how the members of a tetrad are separated during meiosis I?

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For the figure shown here, indicate the correct stage of meiosis and diploid chromosome number.

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The failure of sister chromatids to separate would result in how many normal gametes?

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

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Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo's cell would have ____ tetrads present.

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

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The possibility of Down syndrome increases as the mother's age increases because

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Figure: -Which of the diagrams represents a chromosome pair in a cell at the end of prophase II?

Correct AnswerverifiedShow Answer

Which of the following does not occur twice during meiosis?

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A tetrad is composed of

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The failure of sister chromatids to separate during meiosis is called

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An individual with the karyotype 48, XYYY would have how many Barr bodies?

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

Correct AnswerverifiedShow Answer

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During G₁ stage of interphase, a diploid organism contains how many copies of each gene?

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