Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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A
trait controlled by four alleles is said to have _____. a. | homologous
alleles | c. | hybridization | b. | autosomes | d. | multiple alleles | | | | |
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2.
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The
23rd pair of chromosomes that differ in males and females are called _____. a. | autosomes | c. | multiple
alleles | b. | sex chromosomes | d. | polygenes | | | | |
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Figure 12-1
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3.
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Refer
to Figure 12-1. If individual III-2 marries a person with the same genotype as individual I-1, what
is the chance that one of their children will be afflicted with hemophilia?
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4.
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What
type of inheritance pattern does the trait represented by the shaded symbols in Figure 12-1
illustrate? a. | incomplete
dominance | c. | codominance | b. | multiple alleles | d. | sex-linked | | | | |
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5.
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For
the trait being followed in the pedigree, individuals II-1 and II-4 in Figure 12-1 can be classified
as _____. a. | homozygous
dominant | c. | homozygous
recessive | b. | mutants | d. | carriers | | | | |
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6.
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What
is the relationship between individual I-1 and individual III-2 in Figure 12-1? a. | grandfather-granddaughter | c. | great aunt-nephew | b. | grandmother-grandson | d. | mother-son | | | | |
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7.
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Because the gene for red-green color blindness is located on the X chromosome, it is
normally not possible for a _____. a. | carrier mother to pass the gene on to her
daughter | b. | carrier mother to pass the gene on to her
son | c. | color blind
father to pass the gene on to his daughter | d. | color blind father to pass the gene on to his
son | | |
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Figure 12-3
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8.
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What
is the probable mode of inheritance for the normal trait in Figure 12-3? a. | simple
dominant | c. | sex
linkage | b. | polygenic | d. | multiple alleles | | | | |
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9.
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Based
on Figure 12-3, what do you know about individual III-1's mother? a. | She had the
trait. | c. | She was
homozygous recessive. | b. | She was a carrier. | d. | She was homozygous dominant. | | | | |
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10.
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According to the pedigree in Figure 12-3, how many of the offspring in the III
generation show the normal trait?
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11.
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Royal
hemophilia is the result of _____ inheritance. a. | multiple allelic | c. | sex-linked | b. | polygenic | d. | simple
dominant | | | | |
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12.
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The
blood types A, B, AB, and O are the result of _____ inheritance. a. | multiple
allelic | c. | sex-linked | b. | polygenic | d. | simple dominant | | | | |
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13.
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A
child is diagnosed with a rare genetic disease. Neither parent has the disease. How might the child
have inherited the disorder? a. | The disorder is dominant and was carried by a
parent. | b. | The disorder is recessive and carried by both
parents. | c. | The disorder is sex linked and inherited only from the
father. | d. | The disorder could occur only as a mutation in the child
because neither parent had the disease. | | |
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14.
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Two
healthy parents produce a child with the genetic disorder of cystic fibrosis, which is the result of
a recessive gene. What would be the best explanation for this inheritance? a. | This is not the
result of a genetic disorder. | b. | Both parents carried the recessive gene for cystic
fibrosis. | c. | Cystic fibrosis is a chromosomal mutation that occurred during
development and is not related to the parental genotypes. | d. | Cystic fibrosis
is caused by a mutation in the 21st pair of chromosomes. | | |
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15.
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Which
of the following genetic disorders can be detected by karyotyping? a. | Down syndrome
| b. | Tay-Sachs
disease and phenylketonuria | c. | hemophilia and cystic fibrosis | d. | Klinefelter
syndrome and sickle-cell anemia | | |
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16.
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A man
heterozygous for blood type A marries a woman heterozygous for blood type B. The chance that their
first child will have type O blood is _____.
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17.
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According to Figure 12-5, what is the chance that individual A will be afflicted with
Huntington's?
Figure
12-5
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18.
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Both
hemophilia and red-green color blindness are _____. a. | inherited only
from the mother | c. | caused by a
dominant gene | b. | located on the Y chromosome | d. | sex-linked conditions | | | | |
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19.
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What
phenotype is depicted in Figure 12-8?
Figure 12-8
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