Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1
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What are the possible phenotypes of offspring produced between two pink-flowered
snap dragon plants?
a) | white-flowered, red-flowered, and pink-flowered | b) | pink-flowered and
white-flowered only | c) | pink-flowered only | d) | pink-flowered and
red-flowered only |
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2
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A female is diagnosed with hemophilia, a condition
caused by an X-linked recessive gene. While checking her medical history, the doctor will most likely
discover that
a) | neither parent had hemophilia | c) | both her parents were carriers of the hemophilia
gene | b) | her father had hemophilia and her mother did not have
the disorder | d) | her mother had hemophilia and her father was
normal |
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3
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Refer to the illustration above. The phenotype represented by the cell labeled
“1” is
a) | yellow, inflated. | c) | yellow, constricted. | b) | green, constricted. | d) | green,
inflated. |
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4
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Refer to the illustration above. The genotype represented by the cell labeled
“2” is
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5
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A species of mice can have gray or black fur and long or short tails. A
cross between black-furred, long-tailed mice and gray-furred, short-tailed mice produce all
black-furred, long-tailed offspring. Using the gene symbols G for black, g for gray, S for long
and s for short, what would be the genotype of a gray-furred, short-tailed mouse?
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6
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Hemophilia is a sex-linked recessive trait in humans. If a father and a son are
both hemophiliacs, but the mother is normal, her genotype must be:
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7
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On which of the following chromosomes are sex-linked traits carried?
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8
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The phenotype of an organism
a) | represents its genetic composition. | b) | occurs only in dominant pure
organisms. | c) | is the physical appearance of a trait. | d) | cannot be seen. |
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9
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Situations in which one allele for a gene is not completely dominant over
another allele for that gene are called
a) | multiple genes. | b) | incomplete dominance. | c) | multiple
alleles. | d) | polygenic inheritance. |
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10
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What can we say about the frequency of sex-linked
recessive traits?
a) | sex-linked recessive traits are more common in males
than in females. | c) | It is not possible to determine
whether an sex-linked trait will occur more frequently in males or in
females. | b) | sex-linked recessive traits are more common in females
than in males. | d) | sex-linked recessive traits are expressed about equally in males and
females. |
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11
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If an individual possesses two recessive alleles for the same trait, the
individual is said to be
a) | haploid for the trait. | c) | heterozygous for the trait. | b) | mutated. | d) | homozygous for the trait. |
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12
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Tallness (T) is dominant to shortness (t) in pea plants. Which of
the following represents a genotype of a pea plant that is heterozygous for tallness?
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13
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Which of the following traits is controlled by multiple alleles in
humans?
a) | blood type | c) | sickle cell anemia | b) | Huntington’s disease | d) | hemophilia |
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In rabbits, black fur ( B) is dominant to brown fur ( b). Consider
the following cross between two rabbits.
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14
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Refer to the illustration above. The device shown, which is used to determine
the probable outcome of genetic crosses, is called a
a) | phenotypic paradox. | c) | Mendelian box. | b) | genetic graph. | d) | Punnett square. |
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15
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Refer to the illustration above. Both of the parents in the cross are
a) | black. | c) | brown. | b) | homozygous recessive. | d) | homozygous
dominant. |
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16
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Refer to the illustration above. The phenotype of the offspring indicated by box
3 would be
a) | a mixture of brown and black. | c) | brown. | b) | black. | d) | cannot be determined |
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17
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Since the allele for colorblindness is located on the X chromosome,
colorblindness
a) | cannot be inherited. | c) | occurs only in adults. | b) | is
sex-linked. | d) | is
dominant. |
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18
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Two organisms mate. One is heterozygous for tallness (Tt) and the other is
homozygous recessive (tt). What are the possible phenotypic outcomes for this mating?
a) | 4 tall offspring | c) | 4 dwarves | b) | 2 tall offspring, 2 dwarves | d) | 3 tall offspring, 1
dwarf |
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19
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What would be the blood type of a person who inherited an A allele from
one parent and an O allele from the other?
a) | type A | c) | type AB | b) | type O | d) | type B |
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20
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A diagram in which several generations of a family and the occurrence of certain
genetic characteristics are shown is called a
a) | pedigree. | c) | family karyotype. | b) | Punnett square. | d) | monohybrid
cross. |
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