Question 1

Which of the following is an example of monosomy?

Accepted Answer

A)  Turner's syndrome
B)  Klinefelter's syndrome
C)  Down's syndrome
D)  trisomy XE) All of the above
F) A) and B)

Question 2

In 1985 Hassold and Chiu found that the likelihood of miscarriage increased with maternal age.What is the most likely explanation for the relationship between age and miscarriage?

Accepted Answer

A)  Women in their mid-thirties and older have more health problems that interfere with their ability to maintain pregnancy.
B)  Older women typically have hormonal imbalances that prevent them from carrying a baby to term.
C)  The DNA replication that takes place immediately prior to meiosis is less accurate in older women.
D)  Ova are arrested in meiosis until ovulation.As a result,completion of meiosis in the older woman is more likely to result in aneuploidy or other chromosomal abnormalities.E) A) and B)
F) A) and C)

Question 3

During which phase of meiosis would the cell first become haploid because homologous chromosomes
Separate?

Accepted Answer

A)  anaphase I
B)  metaphase I
C)  anaphase II
D)  telophase IIE) B) and C)
F) A) and D)

Question 4

Chromosome number of hexaploid wheat,Triticum aestivum,can be represented by which of the following?

Accepted Answer

A)  n
B)  2n
C)  4n
D)  6nE) All of the above
F) B) and C)

Question 5

Somatic cells of roundworms have four chromosomes.How many chromosomes would you find in an ovum from a roundworm?

Accepted Answer

A)  four
B)  two
C)  eight
D)  a diploid numberE) None of the above
F) All of the above

Question 6

Adaptation to a changing environment occurs most efficiently through which of the following processes?

Accepted Answer

A)  mutation
B)  asexual reproduction and genetic recombination
C)  sexual reproductionD) A) and B)
E) A) and C)

Question 7

In the snail Pomacea patula catemacensis n = 13.What is the diploid number for this organism?

Accepted Answer

A)  13
B)  26
C)  52
D)  7E) B) and C)
F) B) and D) B

Question 8

The egg of a fruit fly has 4 chromosomes.How many chromosomes are in a somatic cell of a fruit fly?

Accepted Answer

A)  4
B)  2
C)  8
D)  16E) A) and B)
F) All of the above C

Question 9

Which type of reproduction is associated with using the most necessary resources (e.g. ,the most nutrients or most energy) ?

Accepted Answer

A)  binary fission
B)  asexual reproduction
C)  budding
D)  sexual reproductionE) A) and D)
F) C) and D)

Question 10

Which of the following would enable you to detect aneuploidy?

Accepted Answer

A)  autosomy
B)  karyotyping
C)  syngamy
D)  synapsisE) B) and C)
F) A) and D)

Question 11

Genetic recombination takes place in which of the following processes?

Accepted Answer

A)  prophase II of meiosis
B)  alignment of tetrads in metaphase I
C)  crossing over
D)  random alignment of homologous chromosomes in meiosis IE) B) and C)
F) All of the above

Question 12

Hexaploid wheat was produced synthetically by He and co-workers.They mated the diploid species,Aegilops tauschii,and the tetraploid species,T.turgidum.Which of the following is an accurate statement about the relative contribution of each parent to the genome of the hexaploid offspring?

Accepted Answer

A)  Each parent contributed equally to the genome of the offspring.
B)  Aegilops tauschii contributed four chromosomes by failing to complete meiosis after chromosome replication,and T.turgidum contributed two chromosomes.
C)  Aegilops tauschii contributed two chromosomes,and T.turgidum contributed four chromosomes.
D)  The hexaploid number appeared following mitosis with no subsequent cell division.E) A) and C)
F) A) and B)

Question 13

Figure 12.5
-Male grasshoppers (such as the karyotype type shown here) ,have a single X chromosome.How many chromosomes would be in a sperm cell from this grasshopper?

Accepted Answer

A)  11
B)  12
C)  22
D)  23E) B) and C)
F) All of the above

Question 14

What is a major difference between meiosis II and mitosis?

Accepted Answer

A)  Homologues align on the metaphase plate in meiosis II.
B)  Sister chromatids separate in mitosis,and homologues separate in meiosis II.
C)  Meiosis II takes place in a haploid cell,while mitosis takes place in diploid cells.
D)  Crossover takes place in meiosis II.E) C) and D)
F) All of the above C

Question 15

Meiosis involves the creation of haploid cells from diploid cells.The haploid chromosome number is created when _____.

Accepted Answer

A)  homologous chromosomes separate
B)  the S phase of the cell cycle is bypassed during meiotic interphase
C)  sister chromatids separate
D)  ova and sperm go through their respective maturation processesE) C) and D)
F) A) and D)

Question 16

Chromosomes and their homologues align at the equator of the cell during _____.

Accepted Answer

A)  telophase I
B)  metaphase I
C)  telophase II
D)  metaphase IIE) All of the above
F) None of the above

Question 17

Asexual reproduction takes place by which of the following processes?

Accepted Answer

A)  meiosis
B)  fertilization
C)  chromosome exchange between organisms of the same species
D)  mitosisE) A) and C)
F) B) and C)

Question 18

The diploid number of a roundworm species is 4.You have a male and a female roundworm that are planning a family.Assuming there is no crossover,and random segregation of homologues during meiosis,how many different possible combinations of chromosomes might there be in the offspring?

Accepted Answer

A)  4
B)  8
C)  16
D)  64E) A) and B)
F) A) and C)

Question 19

Centromeres split and sister chromosomes migrate to opposite poles in _____.

Accepted Answer

A)  anaphase I
B)  telophase I
C)  anaphase II
D)  telophase IIE) None of the above
F) A) and C)

Question 20

The variation among offspring,and the fact that they are genetically different from their parents,is not due to which of the following?

Accepted Answer

A)  random alignment of homologues during prophase I
B)  crossing over
C)  fertilization
D)  random alignment of sister chromatids in metaphase IIE) None of the above
F) A) and B)

Exam 12: Meiosis

Which of the following is an example of monosomy?

Correct AnswerverifiedShow Answer

In 1985 Hassold and Chiu found that the likelihood of miscarriage increased with maternal age.What is the most likely explanation for the relationship between age and miscarriage?

Correct AnswerverifiedShow Answer

During which phase of meiosis would the cell first become haploid because homologous chromosomes Separate?

Correct AnswerverifiedShow Answer

Chromosome number of hexaploid wheat,Triticum aestivum,can be represented by which of the following?

Correct AnswerverifiedShow Answer

Somatic cells of roundworms have four chromosomes.How many chromosomes would you find in an ovum from a roundworm?

Correct AnswerverifiedShow Answer

Adaptation to a changing environment occurs most efficiently through which of the following processes?

Correct AnswerverifiedShow Answer

In the snail Pomacea patula catemacensis n = 13.What is the diploid number for this organism?

Correct AnswerverifiedB

The egg of a fruit fly has 4 chromosomes.How many chromosomes are in a somatic cell of a fruit fly?

Correct AnswerverifiedC

Which type of reproduction is associated with using the most necessary resources (e.g. ,the most nutrients or most energy) ?

Correct AnswerverifiedShow Answer

Which of the following would enable you to detect aneuploidy?

Correct AnswerverifiedShow Answer

Genetic recombination takes place in which of the following processes?

Correct AnswerverifiedShow Answer

Hexaploid wheat was produced synthetically by He and co-workers.They mated the diploid species,Aegilops tauschii,and the tetraploid species,T.turgidum.Which of the following is an accurate statement about the relative contribution of each parent to the genome of the hexaploid offspring?

Correct AnswerverifiedShow Answer

Figure 12.5 -Male grasshoppers (such as the karyotype type shown here) ,have a single X chromosome.How many chromosomes would be in a sperm cell from this grasshopper?

Correct AnswerverifiedShow Answer

What is a major difference between meiosis II and mitosis?

Correct AnswerverifiedC

Meiosis involves the creation of haploid cells from diploid cells.The haploid chromosome number is created when _____.

Correct AnswerverifiedShow Answer

Chromosomes and their homologues align at the equator of the cell during _____.

Correct AnswerverifiedShow Answer

Asexual reproduction takes place by which of the following processes?

Correct AnswerverifiedShow Answer

The diploid number of a roundworm species is 4.You have a male and a female roundworm that are planning a family.Assuming there is no crossover,and random segregation of homologues during meiosis,how many different possible combinations of chromosomes might there be in the offspring?

Correct AnswerverifiedShow Answer

Centromeres split and sister chromosomes migrate to opposite poles in _____.

Correct AnswerverifiedShow Answer

The variation among offspring,and the fact that they are genetically different from their parents,is not due to which of the following?

Correct AnswerverifiedShow Answer

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C

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