Question 1

A geneticist examines a somatic cell from a fly during metaphase of mitosis and determines that 16 chromatids are present.If a germ-line cell from this species divides by meiosis, then at the end of meiosis I (including the first cytokinesis)  each cell will contain

Accepted Answer

A)  8 chromosomes with 8 DNA molecules.
B)  8 chromosomes with 16 DNA molecules.
C)  4 chromosomes with 4 DNA molecules.
D)  4 chromosomes with 8 DNA molecules.E) B) and C)
F) C) and D)

Question 2

Homologous chromosomes pair along their length during prophase I of meiosis.While two homologues are paired, genetic exchange may occur between them in a process called ________.

Accepted Answer

A)  syngamy
B)  synapsis
C)  independent assortment
D)  crossing overE) A) and C)
F) C) and D)

Question 3

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) All of the above
F) B) and C)

Question 4

A life cycle that regularly alternates between haploid and diploid stages is found in all of the following EXCEPT

Accepted Answer

A)  dogs
B)  the bacterium
C)  alfalfa plants
D)  the mold N.crassaE) B) and C)
F) A) and C)

Question 5

The pairing of homologous chromosomes is called

Accepted Answer

A)  syngamy.
B)  synapsis.
C)  alignment.
D)  independent assortment.E) A) and B)
F) None of the above

Question 6

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) B) and D)
F) None of the above

Question 7

If there were no suppression of DNA replication between meiotic divisions but cytokinesis proceeded normally, what is the most likely outcome of meiosis?

Accepted Answer

A)  4 diploid cells
B)  2 diploid cells
C)  4 haploid cells
D)  2 haploid cellsE) B) and D)
F) B) and C)

Question 8

At the end of meiosis II, each of the four resulting cells contains

Accepted Answer

A)  one full set of chromosomes, each with 2 molecules of DNA.
B)  two full sets of chromosomes, each with 2 molecules of DNA.
C)  one full set of chromosomes, each with 1 molecule of DNA.
D)  two full sets of chromosomes, each with 1 molecule of DNA.E) A) and C)
F) None of the above

Question 9

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

Question 10

You are studying meiosis in an organism where 2n=24.How many chromosomes will each nucleus have after meiosis II is complete?

Accepted Answer

A)  24
B)  12
C)  6
D)  48E) All of the above
F) A) and B)

Question 11

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) A) and D)
F) C) and D)

Question 12

Compared to asexual reproduction, the main advantage of sexual reproduction is that it

Accepted Answer

A)  requires less energy
B)  increases the genetic diversity of the offspring
C)  can produce more complex offspring
D)  can produce a greater number of offspringE) C) and D)
F) A) and C)

Question 13

During meiosis, sister chromatids are held together by

Accepted Answer

A)  a common centromere and kinetochore microtubules.
B)  a common centromere and chiasmata.
C)  a common centromere and polar microtubules.
D)  a common centromere and a protein called cohesion.E) B) and C)
F) None of the above

Question 14

All of the following increase genetic variation EXCEPT

Accepted Answer

A)  crossing over.
B)  random fertilization.
C)  independent assortment.
D)  mitosis.E) None of the above
F) A) and B)

Question 15

One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg.

Accepted Answer

A)  chiasma
B)  homologue
C)  kinetochore
D)  synapsisE) A) and B)
F) None of the above

Question 16

A cell in G2 before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has

Accepted Answer

A)  twice as much DNA and twice as many chromosomes
B)  four times as much DNA and twice as many chromosomes
C)  twice as much DNA but the same number of chromosomes
D)  four times as much DNA and four times as many chromosomesE) B) and C)
F) A) and D)

Question 17

Which of the following statements about crossing over is false?

Accepted Answer

A)  Crossing over takes place between non-sister chromatids.
B)  Crossing over takes place between sister chromatids.
C)  Crossing over occurs during prophase I.
D)  Sites of crossing over are called chiasmata.E) C) and D)
F) None of the above

Question 18

Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n)  ______.

Accepted Answer

A)  zygote
B)  karyotype
C)  embryo
D)  oocyteE) C) and D)
F) B) and D)

Question 19

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

Question 20

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.A cell biologist examines the final products of meiosis in an earthworm (2n=36)  and finds 2 cells with 20 chromosomes, and 2 cells with 16 chromosomes.Most likely this was because

Accepted Answer

A)  2 pairs of sister chromatids failed to separate during meiosis II.
B)  1 pair of sister chromatids failed to separate during meiosis II.
C)  2 pairs of homologous chromosomes failed to separate during meiosis I.
D)  1 pair of homologous chromosomes failed to separate during meiosis I.E) A) and B)
F) All of the above

Exam 11: Sexual Reproduction and Meiosis

During meiosis, sister chromatids are held together by

Correct Answer
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Correct Answer
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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
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Which of the following statements about crossing over is false?

Correct Answer
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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

At the end of meiosis II, each of the four resulting cells contains

Correct Answer
verified

You are studying meiosis in an organism where 2n=24.How many chromosomes will each nucleus have after meiosis II is complete?

Correct Answer
verified

Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ______.

Correct Answer
verified

A life cycle that regularly alternates between haploid and diploid stages is found in all of the following EXCEPT

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

The pairing of homologous chromosomes is called

Correct Answer
verified

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

Correct Answer
verified

Homologous chromosomes pair along their length during prophase I of meiosis.While two homologues are paired, genetic exchange may occur between them in a process called ________.

Correct Answer
verified

All of the following increase genetic variation EXCEPT

Correct Answer
verified

A cell in G₂before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has

Correct Answer
verified

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

Correct Answer
verified

If there were no suppression of DNA replication between meiotic divisions but cytokinesis proceeded normally, what is the most likely outcome of meiosis?

Correct Answer
verified

A geneticist examines a somatic cell from a fly during metaphase of mitosis and determines that 16 chromatids are present.If a germ-line cell from this species divides by meiosis, then at the end of meiosis I (including the first cytokinesis) each cell will contain

Correct Answer
verified

Compared to asexual reproduction, the main advantage of sexual reproduction is that it

Correct Answer
verified

One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg.

Correct Answer
verified

Exam 11: Sexual Reproduction and Meiosis

During meiosis, sister chromatids are held together by

Correct AnswerverifiedShow Answer

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

Which of the following statements about crossing over is false?

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

At the end of meiosis II, each of the four resulting cells contains

Correct AnswerverifiedShow Answer

You are studying meiosis in an organism where 2n=24.How many chromosomes will each nucleus have after meiosis II is complete?

Correct AnswerverifiedShow Answer

Edouard van Beneden proposed that an egg and a sperm, each containing half the complement of chromosomes found in somatic cells, fuse to produce a single cell called a(n) ______.

Correct AnswerverifiedShow Answer

A life cycle that regularly alternates between haploid and diploid stages is found in all of the following EXCEPT

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

The pairing of homologous chromosomes is called

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Homologous chromosomes pair along their length during prophase I of meiosis.While two homologues are paired, genetic exchange may occur between them in a process called ________.

Correct AnswerverifiedShow Answer

All of the following increase genetic variation EXCEPT

Correct AnswerverifiedShow Answer

A cell in G2 before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If there were no suppression of DNA replication between meiotic divisions but cytokinesis proceeded normally, what is the most likely outcome of meiosis?

Correct AnswerverifiedShow Answer

A geneticist examines a somatic cell from a fly during metaphase of mitosis and determines that 16 chromatids are present.If a germ-line cell from this species divides by meiosis, then at the end of meiosis I (including the first cytokinesis) each cell will contain

Correct AnswerverifiedShow Answer

Compared to asexual reproduction, the main advantage of sexual reproduction is that it

Correct AnswerverifiedShow Answer

One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg.

Correct AnswerverifiedShow Answer

Correct Answer
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A cell in G₂before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has

Correct Answer
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