Question 1

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 reproduce by meiosis to produce haploid daughter cells that divide by mitosis to produce a new individual.
D)   diploid gametes reproduce by mitosis to produce diploid daughter cells that divide by meiosis to produce a new individual.
E)   a haploid zygote reproduces by meiosis to produce diploid daughter cells that divide by mitosis to produce a new individual.

Question 2

Which of the following statements is correct?

Accepted Answer

A)   Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei.
B)   Meiosis involves 1 division and produces 2 non-identical daughter nuclei.
C)   Mitosis involves 1 division and produces 2 non-identical daughter nuclei.
D)   Mitosis involves 2 divisions and produces 4 identical daughter nuclei.
E)   Meiosis involves 2 divisions and produces 4 identical daughter nuclei.

Question 3

Down 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 4

It is essential that germ cells undergo meiosis so that

Accepted Answer

A)   the cells can differentiate.
B)   the fertilized egg has half the genetic material of the parents.
C)   the number of chromosomes is cut in half in gametes.
D)   genetic disorders are prevented.
E)   genetic diversity is reduced.

Question 5

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 6

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

Accepted Answer

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

Question 7

A dyad consists of

Accepted Answer

A)   two homologous chromosomes consisting of two sister chromatids.
B)   two homologous chromosomes consisting of two nonsister chromatids.
C)   one duplicated chromosome consisting of two nonsister chromatids.
D)   one duplicated chromosome consisting of two sister chromatids.
E)   two homologous chromosomes consisting of a single DNA strand each.

Question 8

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 9

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 10

Which of the following is not correct 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 is only detectable when it occurs between sister chromatids.
D)   Crossing over occurs during Prophase I when homologous chromosomes line up prior to separation.
E)   In humans, crossing over occurs an average of approximately two events per chromosome.

Question 11

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 12

It would be possible for a male and a female to have exactly the same __________________ but they would have to differ in _____________________.

Accepted Answer

A)   diploid chromosomes; haploid chromosomes
B)   autosomes; sex chromosomes
C)   homologues; autosomes
D)   karyotype; sex chromosomes
E)   karyotype; autosomes

Question 13

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.

Question 14

Which of the following processes does not contribute to creating genetic variability in the offspring?

Accepted Answer

A)   crossing-over
B)   independent assortment of chromosomes
C)   pairing of homologous chromosomes
D)   interkinesis
E)   different alleles of the same gene

Question 15

Following meiosis I,the daughter cells are ______; following meiosis II,the daughter cells are ______; and following mitosis,the daughter cells are _______.

Accepted Answer

A)   diploid; haploid; diploid
B)   diploid; diploid; haploid
C)   haploid; haploid; diploid
D)   haploid; haploid; haploid
E)   diploid; diploid; diploid

Question 16

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 17

You are looking at a cell under the microscope,and see what appears to be several "X" structures being pulled to each side of the cell.What stage of meiosis are you looking at?

Accepted Answer

A)   anaphase I
B)   prophase I
C)   prophase II
D)   metaphase I
E)   anaphase II

Question 18

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 19

How does nondisjunction during meiosis I differ from nondisjunction in meiosis II?

Accepted Answer

A)   Half of the gametes from nondisjunction during meiosis I will have normal chromosome number.
B)   Half of the gametes from nondisjunction during meiosis II will have normal chromosome number.
C)   Gametes from nondisjunction during meiosis I will have an extra chromosome, while gametes from nondisjunction during meiosis II will have a missing chromosome.
D)   Gametes from nondisjunction during meiosis II will have an extra chromosome, while gametes from nondisjunction during meiosis I will have a missing chromosome.
E)   Nondisjunction during meiosis I results in only two gametes, while nondisjunction during meiosis II gives four gametes, half of which have extra or missing chromosomes.

Question 20

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

Exam 9: Meiosis and the Genetic Basis of Sexual Reproduction

Following meiosis I,the daughter cells are ______; following meiosis II,the daughter cells are ______; and following mitosis,the daughter cells are _______.

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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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You are looking at a cell under the microscope,and see what appears to be several "X" structures being pulled to each side of the cell.What stage of meiosis are you looking at?

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Which of the following processes does not contribute to creating genetic variability in the offspring?

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Which of the following statements is correct?

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

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In the human life cycle

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Turner syndrome is associated with which of the following karyotypes?

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Down syndrome is associated with which of the following karyotypes?

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Which of the following is not correct about crossing over?

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It is essential that germ cells undergo meiosis so that

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How does nondisjunction during meiosis I differ from nondisjunction in meiosis II?

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A dyad consists of

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

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It would be possible for a male and a female to have exactly the same __________________ but they would have to differ in _____________________.

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

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The human life cycle consists of

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

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Following meiosis I,the daughter cells are ; following meiosis II,the daughter cells are ; and following mitosis,the daughter cells are ___.

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It would be possible for a male and a female to have exactly the same but they would have to differ in ___.

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