True/False
Indicate whether the statement is true or
false.
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1.
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If you cross two hybrids its possible to get a purebred for a particular
trait.
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2.
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If you cross two homozygous brown guinea pigs, its possible to get black
offspring.
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3.
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If you cross two pea plants each with the genotype (Tt), it is possible that all
the offspring will have a genotype of (tt).
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4.
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Chromosomes are the carriers of genes from parents to offspring.
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5.
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Alleles are different forms of a gene.
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6.
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Marfan syndrome is a genetic disorder.
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Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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7.
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What is probability?
a. | the actual results from a series of events | b. | a number that
describes how likely it is that an event will occur | c. | the way the results of one event affect the
next event | d. | the number of times a coin lands heads up |
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8.
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What is the probability of producing a tall pea plant from a genetic cross
between two hybrid tall pea plants?
a. | one in four | b. | two in four | c. | three in
four | d. | four in four |
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9.
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What does a Punnett square show?
a. | all the possible outcomes of a genetic cross | b. | only the dominant
alleles in a genetic cross | c. | only the recessive alleles in a genetic
cross | d. | all of Mendel’s discoveries about genetic
crosses |
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10.
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If a homozygous black guinea pig (BB) is crossed with a homozygous white
guinea pig (bb), what is the probability that an offspring will have black fur?
a. | 25 percent | b. | 50 percent | c. | 75
percent | d. | 100 percent |
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11.
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An organism’s physical appearance is its
a. | genotype. | b. | phenotype. | c. | codominance. | d. | heterozygous. |
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12.
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An organism’s genotype is its
a. | genetic makeup. | b. | feather color. | c. | physical
appearance. | d. | stem height. |
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13.
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An organism that has two identical alleles for a trait is
a. | codominant. | b. | tall. | c. | homozygous. | d. | heterozygous. |
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14.
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A heterozygous organism has
a. | three different alleles for a trait. | b. | two identical alleles for a
trait. | c. | only one allele for a trait. | d. | two different alleles for a
trait. |
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15.
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Chromosomes are made up of
a. | one pair of alleles. | b. | many traits joined
together. | c. | transfer RNA. | d. | many genes joined
together. |
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16.
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What is a mutation?
a. | any change that is harmful to an organism | b. | any change in a gene
or chromosome | c. | any change that is helpful to an organism | d. | any change in the
phenotype of a cell |
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17.
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A mutation is harmful to an organism if it
a. | changes the DNA of the organism. | b. | changes the phenotype of the
organism. | c. | reduces the organism’s chances for survival and
reproduction. | d. | makes the organism better able to avoid predators. |
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18.
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Which term refers to physical characteristics that are studied in
genetics?
a. | traits | b. | offspring | c. | generations | d. | hybrids |
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19.
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Factors that control traits are called
a. | genes. | b. | purebreds. | c. | recessives. | d. | parents. |
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20.
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The different forms of a gene are called
a. | alleles. | b. | factors. | c. | masks. | d. | traits. |
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21.
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Which combination of sex chromosomes results in a male human being?
a. | XX | b. | YY | c. | XY | d. | either XX or YY |
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22.
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What is a pedigree?
a. | a chart that tracks which members of a family have a particular
trait | b. | a geneticist who studies the inheritance of traits in humans | c. | a picture of all of
the chromosomes in a cell | d. | an allele passed from parent to child on a sex
chromosome |
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23.
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According to the diagram below, which trait is controlled by a dominant
allele?
 a. | white flowers | c. | green seeds | b. | purple flowers | d. | short stems |
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24.
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According to the diagram below, in which generation are the parents
purebreds?
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25.
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According to the diagram below, which generation are the parents
hybrids?
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26.
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According to the diagram below, In the F2 generation, what percentage of
offspring have purple flowers?
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27.
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According to the diagram below, what is the genotype of the purple flowered
offspring in the F2 generation?
 a. | WW | c. | ww | b. | Ww | d. | purple flowers |
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28.
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According to the diagram below, in the F2 generation, what percentage of
offspring have white flowers?
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29.
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According to the diagram below, what are the genotypes of the white flowered
offspring?
 a. | WW and ww | c. | WW and Ww | b. | Ww and ww | d. | WW, Ww and ww |
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30.
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According to the diagram below, what is the phenotype of all the offspring in
the F1 generation?
 a. | Ww | c. | purple flowers | b. | white and purple flowers | d. | white flowers |
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31.
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Suppose one of the parents of the F2 generation was ww instead of WW. What
percentage of offspring would have purple flowers??
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