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    BIO102 Chapter 9

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    genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles.
    During crossing-over,

    genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.

    genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles.

    sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.

    nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles.

    one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles.

    the number of chromosomes is cut in half in gametes.
    It is essential that germ cells undergo meiosis so that

    the cells can differentiate.

    the fertilized egg has half the genetic material of the parents.

    the number of chromosomes is cut in half in gametes.

    genetic disorders are prevented.

    genetic diversity is reduced.

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

    0

    1

    2

    3

    4

    nondisjunction.
    The failure of sister chromatids to separate during meiosis is called

    synapsis.

    crossing-over.

    tetrad formation.

    disjunction.

    nondisjunction.

    homologous: sex
    Chromosomes that occur in pairs and code for the same traits are called _____________ chromosomes; these do not include the __________________ chromosomes which code for gender.

    homologous; autosomes

    autosomes; homologous

    diploid; haploid

    homologous: sex

    sex; autosomes

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

    a zygote with trisomy.

    a zygote with disomy.

    a zygote with monosomy.

    a zygote with normal chromosome number.

    nondisjunction during subsequent mitosis.

    2
    The failure of sister chromatids to separate would result in how many normal gametes?

    0

    1

    2

    3

    4

    one duplicated chromosome consisting of two sister chromatids.
    A dyad consists of

    two homologous chromosomes consisting of two sister chromatids.

    two homologous chromosomes consisting of two nonsister chromatids.

    one duplicated chromosome consisting of two nonsister chromatids.

    one duplicated chromosome consisting of two sister chromatids.

    two homologous chromosomes consisting of a single DNA strand each.

    anaphase II and anaphase of mitosis
    Which of the following phases results in separation of sister chromatids into daughter chromosomes?

    anaphase of mitosis

    anaphase I, anaphase II, and anaphase of mitosis

    anaphase I and anaphase II

    anaphase I and anaphase of mitosis

    anaphase II and anaphase of mitosis

    in metaphase II, dyads align separately at the spindle equator.
    Metaphase II is more similar to metaphase of mitosis than to metaphase I because

    in metaphase I, tetrads align together at the spindle equator.

    in metaphase II, tetrads align separately at the spindle equator.

    in metaphase of mitosis, tetrads align separately at the spindle equator.

    in metaphase II, dyads align separately at the spindle equator.

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

    crossing over occurs in prophase of meiosis I but not in prophase of meiosis II.
    One major difference between meiosis I and meiosis II is that

    crossing over occurs in prophase of meiosis I but not in prophase of meiosis II.

    sister chromatids are separated during meiosis I while homologous chromosomes are separated during meiosis II.

    the resulting cells at the end of meiosis I are diploid while the cells at the end of meiosis II are haploid.

    in telophase of meiosis I four daughter cells form from the parent cell and in telophase of meiosis II each parent cells gives rise to two daughter cells.

    in meiosis I there is no pairing of chromosomes while homologues pair in meiosis II.

    DNA is duplicated during interphase, but not during interkinesis.
    Interphase differs from interkinesis because

    DNA is duplicated during interphase, but not during interkinesis.

    DNA is duplicated during interkinesis, but not during interphase.

    homologous chromosomes separate during interkinesis, but not during interphase.

    homologous chromosomes separate during interphase, but not during interkinesis.

    interkinesis only occurs during mitosis, while interphase occurs during both meiosis and mitosis.

    Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei.
    Which of the following statements is correct?

    Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei.

    Meiosis involves 1 division and produces 2 non-identical daughter nuclei.

    Mitosis involves 1 division and produces 2 non-identical daughter nuclei.

    Mitosis involves 2 divisions and produces 4 identical daughter nuclei.

    Meiosis involves 2 divisions and produces 4 identical daughter nuclei.

    normal disjunction during meiosis, but deletion of portion of the Y chromosome in the male parent.
    Swyer syndrome (46, XY, female appearance), would most likely result from

    nondisjunction during meiosis I in the female parent.

    nondisjunction during meiosis I in the male parent.

    nondisjunction during meiosis II in the female parent.

    nondisjunction during meiosis II in the male parent.

    normal disjunction during meiosis, but deletion of portion of the Y chromosome in the male parent.

    two chromosomes with two sister chromatids each.
    A tetrad is composed of

    two chromosomes with two sister chromatids each.

    two sister chromatids with separate centromeres.

    four chromosomes with two sister chromatids each.

    four sister chromatids with a common centromere.

    four sister chromatids attached at a common centromere.

    32
    Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo’s cell would have ____ tetrads present.

    16

    32

    64

    80

    128

    Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits.
    Which of the following statements is true?

    Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits.

    Homologous chromosomes differ in banding patterns, the traits they code for and size.

    While sex chromosomes determine different genders they look the same until they are stained.

    In humans all 46 chromosomes have an identical match called the homologue.

    Chromosomes are classified into two categories, autosomes that determine gender and the sex chromosomes that determine non-gender related traits.

    chromosomes line up separately, with sister chromatids facing opposite spindle poles.
    During meiosis II,

    homologous chromosomes line up separately, with sister chromatids facing the same spindle pole.

    chromosomes line up separately, with sister chromatids facing opposite spindle poles.

    chromosomes line up separately, with sister chromatids facing the same spindle pole.

    homologous chromosomes line up separately, with sister chromatids facing opposite spindle poles.

    homologous chromosomes line up together, with sister chromatids facing opposite spindle poles.

    Half of the gametes from nondisjunction during meiosis II will have normal chromosome number.
    How does nondisjunction during meiosis I differ from nondisjunction in meiosis II?

    Half of the gametes from nondisjunction during meiosis I will have normal chromosome number.

    Half of the gametes from nondisjunction during meiosis II will have normal chromosome number.

    Gametes from nondisjunction during meiosis I will have an extra chromosome, while gametes from nondisjunction during meiosis II will have a missing chromosome.

    Gametes from nondisjunction during meiosis II will have an extra chromosome, while gametes from nondisjunction during meiosis I will have a missing chromosome.

    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.

    adults who are diploid and produce haploid gametes, these gametes fuse to produce a diploid zygote which grows into an adult.
    The human life cycle consists of

    adults who are haploid and produce diploid gametes, these gametes fuse to produce a haploid zygote which grows into an adult.

    zygotes who are haploid fuse to produce a diploid gamete which grows into an adult.

    gametes that are diploid and produce haploid zygotes, these grow into haploid adults.

    adults who are diploid and produce haploid gametes, these gametes fuse to produce a diploid zygote which grows into an adult.

    adults that are diploid who produce zygotes that are also diploid.

    4
    During prophase I, a diploid organism contains how many copies of each gene?

    1

    2

    3

    4

    8

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

    allele – gene – chromosome

    gene – allele – chromosome

    allele – chromosome – gene

    chromosome – gene – allele

    gene – chromosome – allele

    45, XO
    Turner syndrome is associated with which of the following karyotypes?

    47, XXY

    47, XXX

    46, XY

    47, XY, trisomy 21

    45, XO

    70
    Camels have a diploid chromosome number of 70. At prophase II, each cell would contain how many chromatids?

    0

    35

    70

    140

    280

    Turner syndrome
    Which of the following human syndromes is a monosomy?

    Turner syndrome

    Klinefelter syndrome

    Down syndrome

    Swyer syndrome

    Barr body syndrome

    2
    During prophase II, a diploid organism contains how many copies of each gene?

    1

    2

    3

    4

    8

    47, XY, trisomy 21
    Down syndrome is associated with which of the following karyotypes?

    47, XXY

    47, XXX

    46, XY

    47, XY, trisomy 21

    45, XO

    sister chromatids have the same alleles while non-sister chromatids have different ones.
    Crossing over between sister chromatids does not result in recombination of genetic material while crossing over between non-sister chromatids does because

    sister chromatids have the same alleles while non-sister chromatids have different ones.

    sister chromatids have the same genes while non-sister chromatids have different ones.

    sister chromatids have the same alleles but different genes while non-sister chromatids have different alleles but the same genes.

    non-sister chromatids have the same alleles while sister chromatids have different ones.

    non-sister chromatids have the same genes while sister chromatids have different ones.

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

    diploid chromosomes; haploid chromosomes

    autosomes; sex chromosomes

    homologues; autosomes

    karyotype; sex chromosomes

    karyotype; autosomes

    face opposite spindle poles.
    During meiosis I, the homologous chromosomes of a tetrad

    face the same spindle pole.

    face both spindle poles.

    face opposite spindle poles.

    do not face spindle poles, but are aligned at the spindle equator.

    undergo separation of sister chromatids.

    The two homologous chromosomes of a tetrad separate into different daughter nuclei.
    Which statement best describes how the members of a tetrad are separated during meiosis I?

    The two homologous chromosomes of a tetrad separate into different daughter nuclei.

    The sister chromatids of each chromosome separate into different daughter nuclei.

    The nonsister chromatids of each tetrad separate into different daughter nuclei.

    The two homologous chromosomes of a tetrad separate into one of two daughter nuclei.

    The two homologous chromosomes of a tetrad are duplicated and separate into each daughter nucleus.

    Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei.
    Which of the following statements is correct?

    Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei.

    Meiosis involves 1 division and produces 2 non-identical daughter nuclei.

    Mitosis involves 1 division and produces 2 non-identical daughter nuclei.

    Mitosis involves 2 divisions and produces 4 identical daughter nuclei.

    Meiosis involves 2 divisions and produces 4 identical daughter nuclei.

    an individual with Klinefelter syndrome has a functional SRY gene on his Y chromosome, whereas an individual with Swyer syndrome does not.
    An individual with Swyer syndrome (46, XY) differs from an individual with Klinefelter syndrome (47, XXY) because

    an individual with Swyer syndrome has a Barr body, while an individual with Klinefelter syndrome does not.

    an individual with Klinefelter syndrome has a functional SRY gene on his Y chromosome, whereas an individual with Swyer syndrome does not.

    both individuals have a functional SRY gene, but the extra X chromosome makes the individual with Klinefelter syndrome appear female.

    neither individual has a functional SRY gene, but the X chromosome of the individual with Swyer syndrome has a functional SRY and appears male.

    an individual with Swyer syndrome lacks a functional SRY gene, but appears male because it has moved to the X chromosome as in an individual with Klinefelter syndrome.

    separation of sister chromatids – anaphase II
    Which of the following is a correct match?

    separation of tetrads – anaphase II

    synapsis – metaphase I

    separation of sister chromatids – anaphase I

    synapsis – prophase II

    separation of sister chromatids – anaphase II

    meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.
    In the human life cycle,

    meiosis produces haploid gametes, and fertilization creates a diploid cell that divides by mitosis to produce a new individual.

    mitosis produces haploid gametes, and fertilization creates a diploid cell that divides by meiosis to produce a new individual.

    diploid gametes reproduce by meiosis to produce haploid daughter cells that divide by mitosis to produce a new individual.

    diploid gametes reproduce by mitosis to produce diploid daughter cells that divide by meiosis to produce a new individual.

    a haploid zygote reproduces by meiosis to produce diploid daughter cells that divide by mitosis to produce a new individual.

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

    crossing-over

    independent assortment of chromosomes

    pairing of homologous chromosomes

    interkinesis

    different alleles of the same gene

    cause an organism to grow
    Which of the following is not a function of meiosis?

    cause an organism to grow

    create genetic variability

    reduce the chromosome number in gametes

    keep chromosome number constant from one generation to the next

    produce gametes

    1
    In each gamete following telophase II, how many copies of each gene is/are present?

    1

    2

    3

    4

    8

    the possibility of nondisjunction increases.
    The possibility of Down syndrome increases as the mother’s age increases because

    her DNA is damaged through an accumulation of replication errors.

    her DNA stops checking for replication errors.

    fertilization no longer occurs correctly with older eggs.

    the contents of the egg contains the wrong signals for the correct development of the fetus.

    the possibility of nondisjunction increases.

    30; 120
    Goats have a diploid chromosome number of 60. At prophase I, each cell would have ____ tetrads present, for a total of _____ chromatids.

    30; 120

    30; 60

    60; 120

    60; 240

    30; 240

    diploidy
    All but which one of these results from nondisjunction?

    trisomy

    diploidy

    monosomy

    polyploidy

    Crossing over is only detectable when it occurs between sister chromatids.
    Which of the following is not correct about crossing over?

    Crossing over is preceded by a process known as synapsis where homologous chromosomes attach to each other.

    Crossing over results in greater genetic variability in offspring.

    Crossing over is only detectable when it occurs between sister chromatids.

    Crossing over occurs during Prophase I when homologous chromosomes line up prior to separation.

    In humans, crossing over occurs an average of approximately two events per chromosome.

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