Question 1

In plants and animals,the zygote develops by which of the following processes?

Accepted Answer

A)  mitosis
B)  meiosis
C)  syngamy
D)  synapsis
E)  reduction divisionF) A) and B)
G) D) and E)

Question 2

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) A) and B)
F) A) and C)

Question 3

A cell biologist examines a skin cell from a lizard during metaphase of mitosis and determines that 20 chromatids are present.The role of meiosis in this species is to (Check all that apply)

Accepted Answer

A)  Produce 4 daughter cells that are genetically different from each other.
B)  Produce 4 daughter cells that are genetically different from the original parental cell.
C)  Reduce the number of chromosomes per cell from 10 to 5.
D)  Reduce the number of chromosomes per cell from 20 to 10.E) C) and D)
F) B) and D)

Question 4

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) B) and C)
F) C) and D)

Question 5

Which of the following produces new cells that are genetically identical to the original cell?

Accepted Answer

A)  meiosis
B)  mitosis
C)  crossing over
D)  independent assortment
E)  fertilizationF) A) and B)
G) B) and D)

Question 6

________ cells contain one set of chromosomes.

Accepted Answer

A)  Germ-line
B)  Somatic
C)  Diploid
D)  HaploidE) A) and B)
F) A) and C)

Question 7

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) A) and B)
F) A) and C)

Question 8

The cell produced by the fusion of an egg and a sperm is the

Accepted Answer

A)  gamete.
B)  oocyte.
C)  zygote.
D)  germ line cell.
E)  somatic cell.F) A) and B)
G) C) and E)

Question 9

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 C)
F) C) and D)

Question 10

Which best describes the process of independent assortment?

Accepted Answer

A)  The way one pair of homologues lines up along the metaphase plate does not affect how any other pair lines up.
B)  Segregation of chromosomes during meiosis I is independent of their segregation during meiosis II.
C)  During synapsis,chromosomes pair up at random.
D)  Crossing over along one pair of chromosomes is independent of crossing over along the other pairs.
E)  During synapsis,homologues pair independently of each other.F) None of the above
G) All of the above

Question 11

In 95% of cases of Down's syndrome,there is one extra chromosome (number 21) in every cell.This aneuploid condition is most likely the result of

Accepted Answer

A)  failure to suppress DNA replication between meiosis I and meiosis II.
B)  failure of the chromosomes to assort independently during meiosis.
C)  failure of 1 homologous pair to segregate during meiosis.
D)  failure of 2 homologous pairs to segregate during meiosis.
E)  failure of the cytoplasm to divide at the end of meiosis II.F) A) and B)
G) A) and C)

Question 12

During anaphase I,which best represents segregation of the chromatids that make up one pair of homologues? (M represents a maternal chromatid and P represents a paternal chromatid.Assume no crossing over occurs.)

Accepted Answer

A)  M and M to one pole; P and P to the other pole.
B)  M and P to one pole; M and P to the other pole.
C)  M to one pole; P to the other pole.
D)  half of M and half of P to each pole.
E)  the segregation of these chromatids is completely random.F) B) and D)
G) B) and E)

Question 13

A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32 chromatids are present.The role of fertilization in this species is to (Check all that apply)

Accepted Answer

A)  Produce a new cell that has a combination of chromosomes from 2 different parents.
B)  Increase the number of chromosomes per cell from 16 to 32.
C)  Increase the number of chromosomes per cell from 8 to 16.
D)  Combine the chromosomes from 2 haploid cells into a single diploid cell.E) A) and B)
F) C) and D)

Question 14

All of the following increase genetic variation EXCEPT

Accepted Answer

A)  crossing over.
B)  random fertilization.
C)  independent assortment.
D)  mitosis.
E)  mutation.F) A) and C)
G) B) and D)

Question 15

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 nonsister 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 B)

Question 16

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) A) and D)
F) All of the above

Question 17

All animal cells are diploid except

Accepted Answer

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

Question 18

The most common form of gene therapy involves inserting a normal gene into cells that contain a defective version of the gene.In order to use gene therapy to prevent a man from passing a defective gene on to future generations,you should try to insert normal copies of the gene into

Accepted Answer

A)  blood cells.
B)  germ-line cells.
C)  somatic cells in the testes.
D)  bone marrow cells.E) A) and B)
F) C) and D)

Question 19

In animals,the cells that will eventually undergo meiosis to produce gametes are set aside early in development.These are called

Accepted Answer

A)  somatic cells.
B)  germ-line cells.
C)  sex cells.
D)  gametophytes.
E)  reproductive cells.F) A) and B)
G) A) and C)

Question 20

Which structures indicate where crossing over has occurred?

Accepted Answer

A)  chiasmata
B)  centromeres
C)  kinetochores
D)  centrioles
E)  spindle fibersF) B) and C)
G) B) and E)

Exam 11: Sexual Reproduction and Meiosis

Which of the following produces new cells that are genetically identical to the original cell?

Correct Answer
verified

In animals,the cells that will eventually undergo meiosis to produce gametes are set aside early in development.These are called

Correct Answer
verified

A cell biologist examines a skin cell from a lizard during metaphase of mitosis and determines that 20 chromatids are present.The role of meiosis in this species is to (Check all that apply)

Correct Answer
verified

All of the following increase genetic variation EXCEPT

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

Which structures indicate where crossing over has occurred?

Correct Answer
verified

In 95% of cases of Down's syndrome,there is one extra chromosome (number 21) in every cell.This aneuploid condition is most likely the result of

Correct Answer
verified

During anaphase I,which best represents segregation of the chromatids that make up one pair of homologues? (M represents a maternal chromatid and P represents a paternal chromatid.Assume no crossing over occurs.)

Correct Answer
verified

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

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

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

________ cells contain one set of chromosomes.

Correct Answer
verified

The most common form of gene therapy involves inserting a normal gene into cells that contain a defective version of the gene.In order to use gene therapy to prevent a man from passing a defective gene on to future generations,you should try to insert normal copies of the gene into

Correct Answer
verified

All animal cells are diploid except

Correct Answer
verified

Correct Answer
verified

Which statement about the reductive division of meiosis is false?

Correct Answer
verified

The cell produced by the fusion of an egg and a sperm is the

Correct Answer
verified

A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32 chromatids are present.The role of fertilization in this species is to (Check all that apply)

Correct Answer
verified

Which best describes the process of independent assortment?

Correct Answer
verified

In plants and animals,the zygote develops by which of the following processes?

Correct Answer
verified

Exam 11: Sexual Reproduction and Meiosis

Which of the following produces new cells that are genetically identical to the original cell?

Correct AnswerverifiedShow Answer

In animals,the cells that will eventually undergo meiosis to produce gametes are set aside early in development.These are called

Correct AnswerverifiedShow Answer

A cell biologist examines a skin cell from a lizard during metaphase of mitosis and determines that 20 chromatids are present.The role of meiosis in this species is to (Check all that apply)

Correct AnswerverifiedShow Answer

All of the following increase genetic variation EXCEPT

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

Which structures indicate where crossing over has occurred?

Correct AnswerverifiedShow Answer

In 95% of cases of Down's syndrome,there is one extra chromosome (number 21) in every cell.This aneuploid condition is most likely the result of

Correct AnswerverifiedShow Answer

During anaphase I,which best represents segregation of the chromatids that make up one pair of homologues? (M represents a maternal chromatid and P represents a paternal chromatid.Assume no crossing over occurs.)

Correct AnswerverifiedShow Answer

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

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

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

________ cells contain one set of chromosomes.

Correct AnswerverifiedShow Answer

The most common form of gene therapy involves inserting a normal gene into cells that contain a defective version of the gene.In order to use gene therapy to prevent a man from passing a defective gene on to future generations,you should try to insert normal copies of the gene into

Correct AnswerverifiedShow Answer

All animal cells are diploid except

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement about the reductive division of meiosis is false?

Correct AnswerverifiedShow Answer

The cell produced by the fusion of an egg and a sperm is the

Correct AnswerverifiedShow Answer

A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32 chromatids are present.The role of fertilization in this species is to (Check all that apply)

Correct AnswerverifiedShow Answer

Which best describes the process of independent assortment?

Correct AnswerverifiedShow Answer

In plants and animals,the zygote develops by which of the following processes?

Correct AnswerverifiedShow Answer

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