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Quiz 12
Ch 12
Name________________________
Remote # ____________
1. If a plant is true-breeding for a flower color, it is
__________ for the flower-color gene.
c. polygenic for that gene
d. pleiotropic for that gene
a. homozygous
b. heterozygous
c. dominant
6. Mendel found that the F1 generation in his pea
plant experiments looked like only one of the original
parent plants, but that the flower color trait exhibited
by the other parent showed up again in F2. He
suggested that purple flower color was
____________________ with respect to flower color
in peas.
2. A Punnett square is __________.
a. a method of crossing pea plants
b. a chart that can help you keep
track of the alleles during genetic
crosses
c. named after an Augustinian
monk in Brno, Moravia (currently
part of the Czech Republic)
a. recessive
b. homozygous
c. dominant
d. heterozygous
7. When true breeding snapdragons with red flowers
are cross-bred with true breeding white-flowered
snapdragons, the progeny exhibit a color between
white and red. This is because red and white have
____________________ dominance over each other.
3. If a gene has alleles that are incompletely
dominant, an individual that is heterozygous at this
locus will have characteristics that are __________.
a. the same as organisms that are
homozygous for the recessive allele
b. the same as organisms that are
homozygous for the dominant allele
c. intermediate between organisms
that are homozygous for the
recessive allele and organisms that
are homozygous for the dominant
allele
a.
b.
c.
d.
incomplete
complete
partial
too much
8. What happens if a baby has only one X
chromosome, and no Y?
a. Such a major chromosome
deficiency is lethal, so the baby
would be stillborn.
b. This baby would be a female with
Turner syndrome.
c. The baby would be a male with
Turner syndrome.
d. The individual would have
Klinefelter syndrome.
4. Which one of the following statements is true? (For
extra practice, try to change the incorrect answers to
make them correct statements. Also, give an example
for each of the correct statements.)
a. An allele is either dominant or
recessive, not in between.
b. A particular gene can have only
two alleles.
c. A single gene influences only a
single trait.
d. A single trait can be affected by
many different genes.
e. The environment is irrelevant to
gene expression.
9. The 9:3:3:1 ratio is a ratio of
a. phenotypes in a test cross
b. phenotypes in a cross of
individuals that differ in one trait
c. phenotypes in a cross of
individuals that differ in two traits
d. genotypes in a cross of
individuals that differ in one trait
e. genotypes in a cross of
individuals that differ in two traits
5. A single gene capable of influencing multiple
phenotypes within a single organism is said to be
__________.
a. codominant for that gene
b. incompletely dominant for that
gene
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10. A lawyer tells a male client that blood type cannot
be used to his advantage in a paternity suit against
the client because the child could, in fact, be the
client’s, according to blood type. Which of the
following is the only possible combination supporting
this hypothetical circumstance? (Answers are in the
order mother: father: child.)
a. A:B:O
b. A:O:B
c. AB:A:O
d. AB:O:AB
e. B:O:A
11. Which is NOT true of sickle-cell anemia?
a. It is most common in African
Americans.
b. It involves a one-amino-acid
change in hemoglobin.
c. It involves red blood cells.
d. It is lethal in heterozygotes
because it is dominant.
e. It confers some resistance to
malaria.
12. Sex-linked disorders such as color blindness and
hemophilia are
a. caused by genes on the X
chromosome
b. caused by genes on the
autosome
c. caused by genes on the Y
chromosome
d. expressed only in men
e. expressed only when two
chromosomes are homozygous
recessive
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