Question 1

Figure 13.2
-The karyotype shown above is that of a snail, Pomacea patula catemacensis. What is the diploid number for this organism?

Accepted Answer

A)   46
B)   26
C)   7
D)   13E) None of the above
F) A) and B)

Question 2

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

Accepted Answer

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

Question 3

Figure 13.3
-In Figure 13.3, what major event is taking place during this phase of meiosis?

Accepted Answer

A)   homologues separate
B)   crossing over
C)   separation of sister chromatids
D)   synapsisE) B) and D)
F) None of the above

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) A) and D)

Question 5

At what stage of meiosis does DNA replication take place?

Accepted Answer

A)   DNA replication does not take place in cells destined to undergo meiosis.
B)   between meiosis I and meiosis II
C)   prophase I
D)   None. DNA replication occurs before meiosis I begins.E) C) and D)
F) B) and D)

Question 6

Asexual reproduction takes place by which of the following processes?

Accepted Answer

A)   fertilization
B)   meiosis
C)   mitosis
D)   chromosome exchange between organisms of the same speciesE) B) and C)
F) None of the above

Question 7

In sexual reproduction, the variation among offspring, and the fact that they are genetically different from their parents, is due to which of the following?

Accepted Answer

A)   random process of fertilization
B)   random alignment of homologues during meiosis I
C)   crossing over
D)   all of the above contribute to genetic variability in sexual reproductionE) B) and C)
F) A) and B)

Question 8

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

Accepted Answer

A)   prophase I.
B)   metaphase I.
C)   prophase II.
D)   metaphase II.E) B) and C)
F) A) and D)

Question 9

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

Accepted Answer

A)   a diploid number
B)   two
C)   four
D)   eightE) All of the above
F) A) and D)

Question 10

Sister chromatids separate during

Accepted Answer

A)   metaphase I.
B)   interkinesis.
C)   anaphase II.
D)   anaphase I.E) A) and B)
F) C) and D)

Question 11

Figure 13.6
-Just prior to meiosis, DNA is replicated. Each resulting piece of replicated DNA is considered to be chromosomes)  and is made up of chromatics) .

Accepted Answer

A)   2; 2
B)   1; 4
C)   1; 1
D)   2; 4
E)   1; 2F) C) and D)
G) B) and D)

Question 12

Which of the following is an example of monosomy?

Accepted Answer

A)   Down's syndrome 21, 21, 21) 
B)   Klinefelter's syndrome XXY) 
C)   Turner's syndrome XO) D) A) and B)
E) None of the above

Question 13

Adaptation to a changing environment is likely to occurs most quickly through which of the following processes?

Accepted Answer

A)   asexual reproduction and genetic recombination
B)   sexual reproduction
C)   mutationD) None of the above
E) A) and B)

Question 14

Sexual reproduction

Accepted Answer

A)   can produce diverse phenotypes that may enhance survival of a population in a changing environment.
B)   enables males and females to remain isolated from each other while rapidly colonizing habitats.
C)   allows animals to conserve resources and reproduce only during optimal conditions.
D)   yields more numerous offspring more rapidly than is possible with asexual reproduction.
E)   guarantees that both parents will provide care for each offspring.F) B) and E)
G) A) and D)

Question 15

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

Question 16

Figure 13.5
-Grasshoppers have 11 pair of autosomes, and one sex chromosome. Which chromosome in Figure 13.5 is the sex chromosome?

Accepted Answer

A)   j
B)   e
C)   X
D)   kE) A) and B)
F) A) and C)

Question 17

The diploid number of a roundworm species is 4. You have a male and a female roundworm that are planning a family. Assuming random segregation of homologues during meiosis and no crossover, 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) B) and D)

Question 18

What is a major difference between mitosis and meiosis I?

Accepted Answer

A)   Only meiosis I results in daughter cells that contain identical genetic information.
B)   Sister chromatids separate in mitosis, and homologues separate in meiosis I.
C)   DNA replication takes place prior to mitosis, but not before meiosis I.
D)   Prophase is longer and more complex in mitosis.E) None of the above
F) B) and C)

Question 19

For the duration of meiosis I, each chromosome is

Accepted Answer

A)   in the form of a tetrad.
B)   undergoing synapsis.
C)   a chromosome and its homologue.
D)   two sister chromatids joined by a centromere.E) A) and B)
F) A) and C)

Question 20

Genetic recombination takes place in which of the following processes?

Accepted Answer

A)   crossing over
B)   alignment of tetrads in metaphase I
C)   random alignment of homologous chromosomes in meiosis I
D)   anaphase I of meiosisE) A) and B)
F) A) and C)

Exam 13: Meiosis

Figure 13.2 -The karyotype shown above is that of a snail, Pomacea patula catemacensis. What is the diploid number for this organism?

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What is a major difference between mitosis and meiosis I?

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Genetic recombination takes place in which of the following processes?

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Sexual reproduction

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

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Sister chromatids separate during

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

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Asexual reproduction takes place by which of the following processes?

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Adaptation to a changing environment is likely to occurs most quickly through which of the following processes?

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For the duration of meiosis I, each chromosome is

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

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Figure 13.5 -Grasshoppers have 11 pair of autosomes, and one sex chromosome. Which chromosome in Figure 13.5 is the sex chromosome?

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In sexual reproduction, the variation among offspring, and the fact that they are genetically different from their parents, is due to which of the following?

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Figure 13.3 -In Figure 13.3, what major event is taking place during this phase of meiosis?

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Which of the following is an example of monosomy?

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Figure 13.6 -Just prior to meiosis, DNA is replicated. Each resulting piece of replicated DNA is considered to be chromosomes) and is made up of chromatics) .

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At what stage of meiosis does DNA replication take place?

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Hexaploid wheat was produced synthetically by He and coworkers. 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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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