Multiple Choice Questions

Which of the following statements about meiosis and mitosis is true?
  • Telophase
  • The sequence of bases of a particular gene
  • Anaphase: Sister chromatids separate.
  • Meiosis II is similar to mitosis in that sister chromatids of each chromosome separate.
This image depicts a view of _____ during meiosis.
  • False
  • prophase II
  • True
  • diploid
For the male Drosophila shown in Figure 13.1, what are the (1) haploid number, (2) ploidy, and (3) total number of chromosomes?
  • 1. 3 only 2. 2 or 43. 0 or 64. 2, 3, or 45. 0, 3, or 6
  • (1) 4, (2) 2n, and (3) 8
  • The darkened section will move toward the spindle pole but the distance between chromosomes and the darkened section will remain constant.
In which mitotic phase do the chromosomes condense and does the mitotic spindle begin to form?
  • kinetochore(s)
  • anaphase II
  • prophase
  • interphase
Suppose a diploid cell with three pairs of homologous chromosomes (2n = 6) enters meiosis.How many chromosomes will the resulting gametes have in each of the following cases?meiosis occurs normallynondisjunction of 1 chromosome pair in meiosis Inondisjunction of all 3 chromosome pairs in meiosis Inondisjunction on 1 chromosome in 1 daughter cell in meiosis IInondisjunction of all 3 chromosomes in 1 daughter cell in meiosis II
  • B and C
  • 1. 3 only 2. 2 or 43. 0 or 64. 2, 3, or 45. 0, 3, or 6
  • triploid
What is the ploidy of this cell model? (Figure #1)
  • triploid
  • The darkened section will move toward the spindle pole but the distance between chromosomes and the darkened section will remain constant.
  • True
  • False
The _____________ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell division.
  • independent assortment
  • cytokinesis
  • Sister chromatids
  • mitotic spindle(s)
What proportion (percent) of chromosomes in a human skin cell are paternal chromosomes?
  • False
  • 2n
  • 50%
  • Chiasma
How would genetic variation be affected if, during meiosis I, maternal chromosomes always lined up together on one side of the metaphase plate and paternal chromosomes always lined up on the other side (ignoring the effects of crossing over)?
  • Meiosis II is similar to mitosis in that sister chromatids of each chromosome separate.
  • sister chromatid(s)
  • Kinetochore
  • Gametes would contain either maternal chromosomes only or paternal chromosomes only.
The statement, "It is a matter of chance which homolog goes to which daughter cell" best describes _____.
  • independent assortment
  • Anaphase: Sister chromatids separate.
  • sister chromatid(s)
  • mitotic spindle(s)
What is the ploidy of organisms that have two sets of chromosomes?
  • 2n
  • 50%
  • S
  • 2n+1
This cell is diploid.
  • prophase II
  • True
Mitosis is responsible for what key process in multicellular eukaryotes?
  • interphase
  • Anaphase: Sister chromatids separate.
  • All of the responses are correct.
  • cytokinesis
This cell is 2n = 10.
  • False
  • True
To which part of the centromere do mitotic spindle fibers attach during prometaphase?
  • Metaphase
  • Kinetochore
  • Telophase
  • Sister chromatids
What would be the outcome of meiosis I if none of the homologous chromosomes separate at anaphase?
  • The sequence of bases of a particular gene
  • -crossing over-random fertilization-independent assortment of chromosomes in meiosis
  • One daughter cell would be 2n; the other would have no chromosomes.
  • Gametes would contain either maternal chromosomes only or paternal chromosomes only.
If a cell has 24 chromosomes, how many chromosomes would each of its four daughter cells have after meiosis?
  • 23
  • 2n
  • 16
  • 12
Each chromosome contains one long molecule of double-stranded DNA and proteins.
  • prophase II
  • True
  • False
  • triploid
During mitosis, microtubules attach to chromosomes at the ______________.
  • centromere(s)
  • kinetochore(s)
  • anaphase II
  • Anaphase
The bands on the chromosomes represent certain genes.
  • The darkened section will move toward the spindle pole but the distance between chromosomes and the darkened section will remain constant.
  • True
  • False
  • (1) 4, (2) 2n, and (3) 8
There are five different lengths of chromosomes in this cell.
  • triploid
  • True
  • prophase II
  • diploid
The chromosomes are replicated.
  • True
  • diploid
  • (1) 4, (2) 2n, and (3) 8
  • False
For the experiment shown in Figure 12.6, which answer best describes what the prediction would be if chromosome movement were based on microtubule shortening at the spindle pole?
  • The darkened section will move toward the spindle pole but the distance between chromosomes and the darkened section will remain constant.
  • (1) 4, (2) 2n, and (3) 8
  • 1. 3 only 2. 2 or 43. 0 or 64. 2, 3, or 45. 0, 3, or 6
True or false? Mitosis takes place during M phase, which is the longest phase of the cell cycle.
  • Anaphase: Sister chromatids separate.
  • False
  • prophase
  • Anaphase
Which term describes two recently replicated DNA strands that are joined together just before cell division?
  • centrosome(s)
  • kinetochore(s)
  • Sister chromatids
  • Telophase
Two important checkpoints that regulate the cell's progression through the cell cycle occur in the _____ and _____ phases of the cell cycle.
  • G1, G2
  • 2n+1
  • False
  • Telophase
After chromosomes condense, the ___________ is the region where the identical DNA molecules are most tightly attached to each other.
  • Kinetochore
  • centromere(s)
  • Sister chromatids
  • kinetochore(s)
In most eukaryotes, division of the nucleus is followed by ____________, when the rest of the cell divides.
  • prophase
  • centrosome(s)
  • cytokinesis
  • centromere(s)
Which answer correctly identifies a cell-cycle checkpoint with a criterion for passing it?
  • independent assortment
  • G2 checkpoint: Chromosomes have replicated successfully.
  • Telophase
  • Chiasma
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Multiple Choice Questions
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