Question 1

Which of the following events might result in a human zygote with 45 chromosomes?

Accepted Answer

A)  an error in either egg or sperm meiotic anaphase
B)  failure of the egg nucleus to be fertilized by the sperm
C)  an error in the alignment of chromosomes on the metaphase plate
D)  multiple crossover events during meiosis I

Question 2

During which process does independent assortment of chromosomes occur?

Accepted Answer

A)  during mitosis only
B)  during meiosis I only
C)  during meiosis II only
D)  during mitosis and meiosis I

Question 3

-You have isolated DNA from three different cell types of an organism,determined the relative DNA content for each type,and plotted the results on the graph shown in the figure above.Which sample(s) of DNA might be from a germ cell arrested in prophase I of meiosis?

Accepted Answer

A)  I
B)  II
C)  either I or II
D)  both I and II

Question 4

A human cell containing 22 autosomes and a Y chromosome is

Accepted Answer

A)  a sperm.
B)  an egg.
C)  a zygote.
D)  a somatic cell of a male.

Question 5

If chiasmata can be seen in a cell under a microscope,which of the following meiotic processes must have occurred?

Accepted Answer

A)  meiosis II
B)  anaphase II
C)  prophase I
D)  anaphase I

Question 6

Which of the following statements regarding sexual life cycles is correct?

Accepted Answer

A)  Sexual life cycles can produce both haploid and diploid cells at different stages.
B)  Sexual life cycles can produce only haploid cells at different stages.
C)  Sexual life cycles can produce only diploid cells at different stages.
D)  Sexual life cycles occur only in animals.

Question 7

If a cell has completed the first meiotic division and is just beginning meiosis II,which of the following statements describes the genetic or chromosomal contents of this cell?

Accepted Answer

A)  It has half the amount of DNA of the cell that began meiosis.
B)  It has twice the number of chromosomes.
C)  It has half the chromosomes but twice the DNA of the originating cell.
D)  It is identical in content to another cell from the same meiosis. A

Question 8

Independent assortment of chromosomes during meiosis is a result of

Accepted Answer

A)  the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.
B)  the random nature of the fertilization of ova by sperm.
C)  the random distribution of the sister chromatids to the two daughter cells during anaphase II.
D)  the relatively small degree of homology shared by the X and Y chromosomes.

Question 9

After telophase II of meiosis,the chromosomal makeup of each daughter cell is

Accepted Answer

A)  diploid,and the chromosomes are each composed of a single daughter chromosome.
B)  diploid,and the chromosomes are each composed of two daughter chromosomes.
C)  haploid,and the chromosomes are each composed of a single daughter chromosome.
D)  haploid,and the chromosomes are each composed of two daughter chromosomes.

Question 10

For a species with a haploid number of 23 chromosomes,how many different combinations of maternal and paternal chromosomes are possible for the gametes?

Accepted Answer

A)  23
B)  46
C)  460
D)  approximately 8.4 million

Question 11

When homologous chromosomes cross over,what is the result?

Accepted Answer

A)  Two sister chromatids get tangled,resulting in one altering the sequence of its DNA.
B)  Two sister chromatids exchange identical pieces of DNA.
C)  Specific proteins break the two strands of nonsister chromatids and re-join them.
D)  Each of the four DNA strands of a homologous pair is broken,and the pieces are mixed.

Question 12

If the DNA content of a diploid cell in the G1 phase of the cell cycle is 24 fg (femtograms) ,then the DNA content of the same cell at metaphase of meiosis II would be

Accepted Answer

A)  12 fg.
B)  6 fg.
C)  24 fg.
D)  48 fg.

Question 13

During mitosis or meiosis,sister chromatids are held together by proteins referred to as cohesins.Such molecules must have which of the following properties?

Accepted Answer

A)  They must persist throughout the cell cycle.
B)  They must be removed before meiosis can begin.
C)  They must be removed before sister chromatids or homologous chromosomes can separate.
D)  They must be intact for nuclear envelope re-formation. C

Question 14

Which of the following types of organisms has both diploid and haploid forms that exist as separate individuals?

Accepted Answer

A)  animals
B)  fungi
C)  protists
D)  some algae

Question 15

Which of the following elements do all sexual life cycles in eukaryotic organisms have in common?

Accepted Answer

A)  alternation of generations,gametes,and spores
B)  alternation of generations,meiosis,and gametes
C)  meiosis,fertilization,and gametes
D)  meiosis,gametes,and spores C

Question 16

In a life cycle such as that shown in diagram II of Figure 10.6 above,if the zygote's chromosome number is 10,which of the following will be true?

Accepted Answer

A)  The sporophyte's chromosome number per cell is 10,and the gametophyte's is 5.
B)  The sporophyte's chromosome number per cell is 5,and the gametophyte's is 10.
C)  The sporophyte and gametophyte each have 10 chromosomes per cell.
D)  The sporophyte and gametophyte each have 5 chromosomes per cell.

Question 17

Figure 10.6
-Refer to the life cycles illustrated in Figure 10.6 above.Which of the life cycles is (are) typical for animals?

Accepted Answer

A)  I only
B)  II only
C)  III only
D)  I and II

Question 18

Which of the following statements correctly describes the differences between sexual and asexual reproduction?

Accepted Answer

A)  Asexual reproduction,but not sexual reproduction,is characteristic of all living organisms.
B)  In sexual reproduction,offspring vary genetically from their siblings and both parents.
C)  In asexual reproduction,offspring are produced by fertilization of sperm and egg.
D)  Asexual reproduction produces offspring that vary genetically from the parent.

Question 19

In a human karyotype,chromosomes are arranged in 23 pairs.If we choose one of these pairs,such as pair 14,which of the following characteristics are most likely for the two chromosomes of the pair to have in common?

Accepted Answer

A)  length and position of the centromere only
B)  length,centromere position,and staining pattern only
C)  length,centromere position,staining pattern,and traits coded for by their genes
D)  length,centromere position,staining pattern,and DNA sequences

Question 20

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?

Accepted Answer

A)  They have half the number of chromosomes and half the amount of DNA.
B)  They have the same number of chromosomes and half the amount of DNA.
C)  They have half the number of chromosomes and one-fourth the amount of DNA.
D)  They have half the amount of cytoplasm and twice the amount of DNA.

Exam 10: Meiosis and Sexual Life Cycles

Which of the following events might result in a human zygote with 45 chromosomes?

Correct AnswerverifiedShow Answer

During which process does independent assortment of chromosomes occur?

Correct AnswerverifiedShow Answer

-You have isolated DNA from three different cell types of an organism,determined the relative DNA content for each type,and plotted the results on the graph shown in the figure above.Which sample(s) of DNA might be from a germ cell arrested in prophase I of meiosis?

Correct AnswerverifiedShow Answer

A human cell containing 22 autosomes and a Y chromosome is

Correct AnswerverifiedShow Answer

If chiasmata can be seen in a cell under a microscope,which of the following meiotic processes must have occurred?

Correct AnswerverifiedShow Answer

Which of the following statements regarding sexual life cycles is correct?

Correct AnswerverifiedShow Answer

If a cell has completed the first meiotic division and is just beginning meiosis II,which of the following statements describes the genetic or chromosomal contents of this cell?

Correct AnswerverifiedA

Independent assortment of chromosomes during meiosis is a result of

Correct AnswerverifiedShow Answer

After telophase II of meiosis,the chromosomal makeup of each daughter cell is

Correct AnswerverifiedShow Answer

For a species with a haploid number of 23 chromosomes,how many different combinations of maternal and paternal chromosomes are possible for the gametes?

Correct AnswerverifiedShow Answer

When homologous chromosomes cross over,what is the result?

Correct AnswerverifiedShow Answer

If the DNA content of a diploid cell in the G1 phase of the cell cycle is 24 fg (femtograms) ,then the DNA content of the same cell at metaphase of meiosis II would be

Correct AnswerverifiedShow Answer

During mitosis or meiosis,sister chromatids are held together by proteins referred to as cohesins.Such molecules must have which of the following properties?

Correct AnswerverifiedC

Which of the following types of organisms has both diploid and haploid forms that exist as separate individuals?

Correct AnswerverifiedShow Answer

Which of the following elements do all sexual life cycles in eukaryotic organisms have in common?

Correct AnswerverifiedC

In a life cycle such as that shown in diagram II of Figure 10.6 above,if the zygote's chromosome number is 10,which of the following will be true?

Correct AnswerverifiedShow Answer

Figure 10.6 -Refer to the life cycles illustrated in Figure 10.6 above.Which of the life cycles is (are) typical for animals?

Correct AnswerverifiedShow Answer

Which of the following statements correctly describes the differences between sexual and asexual reproduction?

Correct AnswerverifiedShow Answer

In a human karyotype,chromosomes are arranged in 23 pairs.If we choose one of these pairs,such as pair 14,which of the following characteristics are most likely for the two chromosomes of the pair to have in common?

Correct AnswerverifiedShow Answer

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?

Correct AnswerverifiedShow Answer

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A

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If the DNA content of a diploid cell in the G₁ phase of the cell cycle is 24 fg (femtograms) ,then the DNA content of the same cell at metaphase of meiosis II would be

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