Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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Nondisjunction occurs when
a. | a portion of a chromosome breaks off and is lost. | b. | two chromosomes fuse
into one. | c. | members of a chromosome pair fail to separate. | d. | chromosomes
replicate too many times. | e. | an entire pair of chromosomes is lost during
meiosis I. |
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2.
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If a parent cell has 16 chromosomes and undergoes meiosis, the resulting cells
will have how many chromosomes?
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3.
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Homologous chromosomes
a. | may exchange parts during meiosis. | b. | have alleles for the same characteristics even
though the gene expression may not be the same. | c. | are in pairs, one chromosome of each pair from
the father and one from the mother. | d. | pair up during meiosis. | e. | all of
these |
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Answer the following questions based on your understanding of the events going
on in the cell diagramed below.
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4.
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Which statement is false?
a. | n=2. | b. | There are two tetrads in the
diagram. | c. | Crossing over may be occurring during this stage. | d. | This diagram
represents a stage of mitosis. | e. | There are two pairs of homologous chromosomes
in the diagram. |
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The following graph tracks the amount of DNA in a single nucleus through the
process of meiosis. Answer the questions based on the graph.
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5.
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Meiosis I is which group of the following stages?
a. | I, II, III | b. | IV, V, VI, VII | c. | VIII, IX, X,
XI | d. | I, II, III, IV, V, VI, VII | e. | None of the above
combinations |
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6.
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Which of the following statements is false?
a. | Tetrads form during IV. | b. | Cells are diploid during
IV. | c. | Cells are diploid during XII. | d. | DNA is replicated once during this
process. | e. | The cell divides twice during this process. |
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7.
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During which stage is the amount of DNA in the cell characterized as 1n?
a. | I | b. | IV | c. | VII | d. | XII | e. | None of the
above. |
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Answer the following questions based on this diagram:
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8.
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Which statement is true?
a. | The karyotype was taken from a male. | b. | The karyotype shows 22
chromosomes. | c. | The karyotype belongs to an individual with trisomy 21. | d. | The DNA shown here
must have been taken from a cell in interphase. | e. | Each chromosome is made up of multiple
molecules of DNA. |
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9.
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The cause of the above disorder is most likely:
a. | Genetic mutations in DNA sequence. | b. | Cells’ inability to complete cytokinesis
after mitosis. | c. | Nondisjunction during meiosis. | d. | Nondisjunction during
mitosis. | e. | Caused by an toxin that interrupts the regulation of the cell
cycle. |
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