Multiple Choice (Value 15)
Identify the choice that best completes the statement or answers
the question.
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1.
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The number of chromosomes in a gamete is represented by the symbol
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2.
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If an organism’s diploid number is 12, its haploid number is
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3.
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Gametes have
a. | homologous chromosomes. | b. | twice the number of chromosomes found in body
cells. | c. | two sets of chromosomes. | d. | one allele for each
gene. |
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4.
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Gametes are produced by the process of
a. | mitosis. | c. | crossing-over. | b. | meiosis. | d. | replication. |
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Figure
11–3
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5.
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What is shown in Figure 11–3?
a. | independent assortment | c. | crossing-over | b. | anaphase I of meiosis | d. | replication |
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6.
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Chromosomes form tetrads during
a. | prophase I of meiosis. | c. | interphase. | b. | metaphase I of meiosis. | d. | anaphase II of
meiosis. |
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7.
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What happens between meiosis I and meiosis II that reduces the number of
chromosomes?
a. | Crossing-over occurs. | c. | Replication occurs twice. | b. | Metaphase
occurs. | d. | Replication does
not occur. |
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8.
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Unlike mitosis, meiosis results in the formation of
a. | diploid cells. | c. | 2N daughter cells. | b. | haploid cells. | d. | body cells. |
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9.
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Unlike mitosis, meiosis results in the formation of
a. | two genetically identical cells. | c. | four genetically identical
cells. | b. | four genetically different cells. | d. | two genetically different
cells. |
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10.
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Crossing-over rarely occurs in mitosis, unlike meiosis. Which of the following
is the likely reason?
a. | Chromatids are not involved in mitosis. | b. | Tetrads rarely form
during mitosis. | c. | A cell undergoing mitosis does not have homologous chromosomes. | d. | There is no prophase
during mitosis. |
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11.
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Which of the following assort independently?
a. | chromosomes | c. | multiple alleles | b. | genes on the same
chromosome | d. | codominant
alleles |
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12.
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Linked genes
a. | are never separated. | c. | are on the same chromosome. | b. | assort
independently. | d. | are always
recessive. |
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13.
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Gene maps are based on
a. | the frequencies of crossing-over between genes. | b. | independent
assortment. | c. | genetic diversity. | d. | the number of genes in a
cell. |
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14.
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If two genes are on the same chromosome and rarely assort independently,
a. | crossing-over never occurs between the genes. | b. | crossing-over always
occurs between the genes. | c. | the genes are probably located far apart from
each other. | d. | the genes are probably located close to each other. |
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15.
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The farther apart two genes are located on a chromosome, the
a. | less likely they are to be inherited together. | b. | more likely they are
to be linked. | c. | less likely they are to assort independently. | d. | less likely they are
to be separated by a crossover during meiosis. |
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Modified True/False (Value 5)
Indicate whether the statement is true or false. If false,
change the identified word or phrase to make the statement true.
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16.
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If an organism has 16 chromosomes in each of its egg cells, the organism’s
diploid number is 32. _________________________
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17.
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If an organism is heterozygous for a particular gene, the two different alleles
will be separated during anaphase II of meiosis, assuming that no crossing-over has occurred.
_________________________
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18.
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Mitosis results in two cells, whereas meiosis results in one cell.
_________________________
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19.
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If an organism has four linkage groups, it has eight pairs of
chromosomes. _________________________
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20.
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Genes in the same linkage group are usually inherited separately.
_________________________
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Short Answer (Value 4)
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21.
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Contrast the cells produced by mitosis with those produced by meiosis.
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22.
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What is a linkage group?
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