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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Which of the following traits is controlled by multiple alleles in
humans?
A) | sickle cell anemia | C) | Huntington’s disease | B) | blood
type | D) | hemophilia |
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In humans, having freckles ( F) is dominant to not having freckles
( f). The inheritance of these traits can be studied using a Punnett square similar to the one
shown below.
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2
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Refer to the illustration above. The parents shown in the Punnett square could
have children with a phenotype ratio of
A) | 3:1. | C) | 1:2:1. | B) | 4:0. | D) | 2:2. |
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3
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Refer to the illustration above. Which box in the Punnett square represents a
child who does not have freckles?
A) | box 4 | C) | box 1 | B) | box 3 | D) | box 2 |
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4
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Refer to the illustration above. The child represented in box 1 in the Punnett
square would
A) | have an extra freckles chromosome. | C) | be heterozygous for
freckles. | B) | not have freckles. | D) | be homozygous for freckles. |
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5
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Refer to the illustration above. The child in box 3 of the Punnett square has
the genotype
A) | FF. | C) | Ff. | B) | ff. | D) | None of the
above |
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6
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Two black guinea pigs bred and produced 3 black offspring and 2 albino
offspring.Assuming no mutations, which guinea pigs must be heterozygous?
A) | All 3 black offspring | C) | Both albino offspring | B) | Exactly 2 of the
black offspring | D) | Both
parents |
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7
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If you had two guinea pigs of opposite sex, both homozygous, one black and one
brown, but you didn't know which was the dominant characteristic, how would you find out the
dominant color?
A) | Mate them together and see what color the offspring are--the other will be the
dominant color. | C) | Mate them together , then mate their offspring to see what color the grandchildren
are--that will be the dominant color. | B) | Mate them together and see what color the
offspring are--that will be the dominant color. | D) | Mate them together, then mate their offspring
to see what color the grandchildren are--the other color will be the dominant color.
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8
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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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9
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If an individual possesses two recessive alleles for the same trait, the
individual is said to be
A) | heterozygous for the trait. | C) | homozygous for the
trait. | B) | haploid for the trait. | D) | mutated. |
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10
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In snapdragons, inherting one gene for red flower color and one gene for white
flower color produces pink flowers. This type of inheritance is called
A) | incomplete dominance | C) | muliple alleles | B) | polygenic traits | D) | codominance |
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11
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The alternate forms of a gene on homologous
chromosomes are called A) | tetrads. | C) | centromeres. | B) | alleles. | D) | homozygotes. |
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12
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Since the allele for colorblindness is located on the X chromosome,
colorblindness
A) | occurs only in adults. | C) | is sex-linked. | B) | cannot be inherited. | D) | None of the
above |
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13
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An individual heterozygous for a trait and an individual homozygous recessive
for the trait are crossed and produce many offspring that are
A) | of two different phenotypes. | C) | all the same
genotype. | B) | all the same phenotype. | D) | of three different phenotypes. |
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14
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Which blood type would not be possible for children of a type AB mother and a
type A father?
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15
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The genotype for F1 individuals from a dihybrid cross is AaBb x AaBB.
What is the expected ratio of AaBb individuals in the F2 generation?
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16
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The scientific study of heredity is called
A) | genetics. | C) | pollination. | B) | meiosis. | D) | crossing-over. |
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17
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The phenotype of an organism
A) | occurs only in dominant pure organisms. | B) | cannot be
seen. | C) | is the physical appearance of a trait. | D) | represents its genetic
composition. |
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18
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Which of the following crosses would always result in offspring that only
display the dominant phenotype?
A) | tt x tt | C) | Tt x Tt | B) | Tt x tt | D) | TT x tt |
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19
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According to the pedigree diagrammed above the
original parents of this family tree had A) | 2 daughters and 3 sons | C) | 1 daughter and 2 sons
| B) | 3 daughters and 2 sons | D) | 2 daughters and 1 son |
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20
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The inheritance pattern illustrated in the pedigree diagrammed above is
A) | autosomal dominant | C) | sexlinked recessive | B) | autosomal recessive | D) | sexlinked
dominant |
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