Question 1

______ is a process of nuclear division which reduces the number of chromosomes per cell from 2 sets to 1 set.

Accepted Answer

A)  Mitosis
B)  Meiosis
C)  Binary fission
D)  SyngamyE) B) and D)
F) A) and D)

Question 2

You are studying meiosis in an organism where 2n= 28.How many chromosomes will be present in each cell after meiosis I is complete but before meiosis II begins?

Accepted Answer

A)  7
B)  14
C)  28
D)  56E) A) and B)
F) A) and C)

Question 3

Meiosis results in a reassortment of maternal chromosomes (inherited from the mother)  and paternal chromosomes (inherited from the father) .If n=4 for a given species, and ignoring the effects of crossing over, what is the probability that a gamete will receive only paternal chromosomes?

Accepted Answer

A)  1/2
B)  1/4
C)  1/8
D)  1/16E) A) and D)
F) B) and D)

Question 4

Which structures indicate where crossing over has occurred?

Accepted Answer

A)  chiasmata
B)  centromeres
C)  kinetochores
D)  centriolesE) B) and C)
F) C) and D) A

Question 5

Why does sexual reproduction require both meiosis and syngamy?

Accepted Answer

A)  The process of meiosis results in the production of gametes in which the number of chromosomes remains the same.During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount.Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained.
B)  The process of meiosis results in the production of gametes in which the number of chromosomes is reduced by half.During syngamy, two gametes fuse to form a new cell, and the number of chromosomes is restored to the full amount.Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained.
C)  The process of meiosis results in the production of gametes in which the number of chromosomes is doubled.During syngamy, gametes are reduced by half, and the number of chromosomes is restored to the full amount.Therefore, by coupling meiosis and syngamy, the organism ensures that the proper number of chromosomes will be maintained.D) B) and C)
E) All of the above

Question 6

Crossing over between homologous chromosomes takes place during

Accepted Answer

A)  prophase II.
B)  prophase I.
C)  interphase II.
D)  interphase I.E) All of the above
F) B) and C) B

Question 7

You are comparing the events of meiosis I in cells from several different organisms.You come across one species in which you do not observe any chiasmata.The best conclusion to make is

Accepted Answer

A)  there is no crossing over between non-sister chromatids
B)  kinetochores of sister chromatids do not fuse
C)  the chromosome pairs will not assort independently
D)  chiasmata will form during meiosis IIE) A) and D)
F) A) and C)

Question 8

Non-disjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis.As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell.This produces daughter cells with an imbalance of chromosomes.If 18 pairs of sister chromatids segregate normally during meiosis II in cats (n=19)  but we have non-disjunction of 1 pair, then at the end of meiosis II we will have

Accepted Answer

A)  3 cells with 20 chromosomes and 1 cell with 18.
B)  2 cells with 20 chromosomes and 2 cells with 18.
C)  2 cells with 19 chromosomes, 1 with 20, and 1 with 18.
D)  3 cells with 18 chromosomes and 1 cell with 20.E) All of the above
F) A) and D)

Question 9

Which best explains the process of meiosis?

Accepted Answer

A)  The cells that result from meiosis I are haploid, and each chromosome consists of 1 chromatid.
B)  The cells that result from meiosis I are haploid, and each chromosome consists of 2 chromatids.
C)  The cells that result from meiosis II are haploid, and each chromosome consists of 2 chromatids.
D)  The cells that result from meiosis I are diploid, and each chromosome consists of 2 chromatids.E) All of the above
F) A) and B)

Question 10

In meiosis, sister kinetochores are attached to the same pole of the cell during meiosis I, and sister chromatid cohesion is released during anaphase II.What would be the likely result if sister kinetochores were attached to different poles of the cell during meiosis I and sister chromatid cohesion was released during anaphase I?

Accepted Answer

A)  Sister chromatids would migrate to opposite poles during anaphase I.
B)  Sister chromatids would migrate to opposite poles during anaphase II.
C)  Sister chromatids would migrate to the same pole during anaphase I.
D)  Sister chromatids would migrate to the same pole during anaphase II.E) A) and C)
F) B) and D)

Question 11

Which statement about the reductive division of meiosis is false?

Accepted Answer

A)  During the reductive division, homologues migrate to opposite poles of the cell.
B)  During the reductive division, sister chromatids migrate to opposite poles of the cell.
C)  During the reductive division, centromeres do not divide.
D)  At the end of the reductive division, each daughter nucleus has one-half as many centromeres as the parental nucleus.E) B) and D)
F) C) and D)

Question 12

What immediately follows meiosis I?

Accepted Answer

A)  DNA replication
B)  prophase II
C)  metaphase II
D)  synapsis of homologuesE) A) and B)
F) B) and C)

Question 13

______ cells contain one set of chromosomes.

Accepted Answer

A)  Germ-line
B)  Somatic
C)  Diploid
D)  HaploidE) None of the above
F) A) and B)

Question 14

The pairing of chromosomes along their lengths, which is essential for crossing over, is referred to as

Accepted Answer

A)  syngamy.
B)  synapsis.
C)  prophase.
D)  recombination.E) None of the above
F) All of the above B

Question 15

In life cycles that alternate between haploid and diploid stages, fertilization doubles the number of chromosomes per cell while ______ reduces it in half.

Accepted Answer

A)  mitosis
B)  meiosis
C)  binary fission
D)  syngamyE) B) and C)
F) All of the above

Question 16

All animal cells are diploid except

Accepted Answer

A)  gametes.
B)  muscle cells.
C)  nerve cells.
D)  germ-line cells.E) A) and D)
F) B) and C)

Question 17

The synaptonemal complex is

Accepted Answer

A)  a cluster of microtubules at each pole of the cell.
B)  a network of microtubules that forms the spindle apparatus.
C)  a network of proteins that holds homologues together.
D)  the area where microtubules attach to the centromere of each chromosome.E) B) and C)
F) B) and D)

Question 18

Which of the following is likely to occur if you were to prevent cyclin B from associating with its cyclin-dependent kinase near the end of meiosis I?

Accepted Answer

A)  failure to maintain sister chromatid cohesion at the centromere
B)  failure to form initiation complexes necessary for DNA replication to proceed
C)  suppression of DNA replication
D)  activation of DNA replicationE) A) and B)
F) A) and C)

Question 19

The point of connection between two sister chromatids, before anaphase II of meiosis separates them, is called the

Accepted Answer

A)  centriole
B)  kinetochore.
C)  centromere.
D)  spindle apparatus.E) B) and D)
F) B) and C)

Question 20

The Rec8 protein holds sister chromatids together during meiosis.If an individual has a mutation that prevents degradation of Rec8, this would most likely prevent

Accepted Answer

A)  normal segregation during meiosis I.
B)  normal segregation during meiosis II.
C)  synapsis of homologous chromosomes.
D)  crossing over during prophase I.E) All of the above
F) B) and D)

Exam 11: Sexual Reproduction and Meiosis

______ is a process of nuclear division which reduces the number of chromosomes per cell from 2 sets to 1 set.

Correct Answer
verified

You are studying meiosis in an organism where 2n= 28.How many chromosomes will be present in each cell after meiosis I is complete but before meiosis II begins?

Correct Answer
verified

Meiosis results in a reassortment of maternal chromosomes (inherited from the mother) and paternal chromosomes (inherited from the father) .If n=4 for a given species, and ignoring the effects of crossing over, what is the probability that a gamete will receive only paternal chromosomes?

Correct Answer
verified

Which structures indicate where crossing over has occurred?

Correct Answer
verified
A

Why does sexual reproduction require both meiosis and syngamy?

Correct Answer
verified

Crossing over between homologous chromosomes takes place during

Correct Answer
verified
B

You are comparing the events of meiosis I in cells from several different organisms.You come across one species in which you do not observe any chiasmata.The best conclusion to make is

Correct Answer
verified

Correct Answer
verified

Which best explains the process of meiosis?

Correct Answer
verified

Correct Answer
verified

Which statement about the reductive division of meiosis is false?

Correct Answer
verified

What immediately follows meiosis I?

Correct Answer
verified

______ cells contain one set of chromosomes.

Correct Answer
verified

The pairing of chromosomes along their lengths, which is essential for crossing over, is referred to as

Correct Answer
verified
B

In life cycles that alternate between haploid and diploid stages, fertilization doubles the number of chromosomes per cell while ______ reduces it in half.

Correct Answer
verified

All animal cells are diploid except

Correct Answer
verified

The synaptonemal complex is

Correct Answer
verified

Which of the following is likely to occur if you were to prevent cyclin B from associating with its cyclin-dependent kinase near the end of meiosis I?

Correct Answer
verified

The point of connection between two sister chromatids, before anaphase II of meiosis separates them, is called the

Correct Answer
verified

The Rec8 protein holds sister chromatids together during meiosis.If an individual has a mutation that prevents degradation of Rec8, this would most likely prevent

Correct Answer
verified

Exam 11: Sexual Reproduction and Meiosis

______ is a process of nuclear division which reduces the number of chromosomes per cell from 2 sets to 1 set.

Correct AnswerverifiedShow Answer

You are studying meiosis in an organism where 2n= 28.How many chromosomes will be present in each cell after meiosis I is complete but before meiosis II begins?

Correct AnswerverifiedShow Answer

Meiosis results in a reassortment of maternal chromosomes (inherited from the mother) and paternal chromosomes (inherited from the father) .If n=4 for a given species, and ignoring the effects of crossing over, what is the probability that a gamete will receive only paternal chromosomes?

Correct AnswerverifiedShow Answer

Which structures indicate where crossing over has occurred?

Correct AnswerverifiedA

Why does sexual reproduction require both meiosis and syngamy?

Correct AnswerverifiedShow Answer

Crossing over between homologous chromosomes takes place during

Correct AnswerverifiedB

You are comparing the events of meiosis I in cells from several different organisms.You come across one species in which you do not observe any chiasmata.The best conclusion to make is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which best explains the process of meiosis?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement about the reductive division of meiosis is false?

Correct AnswerverifiedShow Answer

What immediately follows meiosis I?

Correct AnswerverifiedShow Answer

______ cells contain one set of chromosomes.

Correct AnswerverifiedShow Answer

The pairing of chromosomes along their lengths, which is essential for crossing over, is referred to as

Correct AnswerverifiedB

In life cycles that alternate between haploid and diploid stages, fertilization doubles the number of chromosomes per cell while ______ reduces it in half.

Correct AnswerverifiedShow Answer

All animal cells are diploid except

Correct AnswerverifiedShow Answer

The synaptonemal complex is

Correct AnswerverifiedShow Answer

Which of the following is likely to occur if you were to prevent cyclin B from associating with its cyclin-dependent kinase near the end of meiosis I?

Correct AnswerverifiedShow Answer

The point of connection between two sister chromatids, before anaphase II of meiosis separates them, is called the

Correct AnswerverifiedShow Answer

The Rec8 protein holds sister chromatids together during meiosis.If an individual has a mutation that prevents degradation of Rec8, this would most likely prevent

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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A

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B

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B

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