1. A scientist observes that a certain trait is determined by a single
allele. An organism inherited one version of the trait from one parent
and another version from the other parent. Both versions of the trait
are expressed in the phenotype of the offspring. Which pattern of
inheritance best classifies the observed trait?
A. dominance
b. sex-linkage
c. co-dominance
d. incomplete dominance
c. Co-dominance
2. An organism that has inherited two of the same alleles of a gene
from its parents is ______________ for that trait.
a. hereditary
b. heterozygous
c. homozygous
d. hemizygous
c. homozygous
3. If a characteristic is X-linked, it
a. occurs mostly in males.
b. occurs only in males.
c. occurs mostly in females.
d. occurs only in females.
A. Occurs mostly in males
Questions 4–5 refer to the figure below, which shows a cross between two
rabbits. In rabbits, black fur (B) is dominant to brown fur (b).
4.
The fur in both of the parents in the cross is
a. black.
b. brown.
c. homozygous dominant.
d. homozygous recessive.
a. black
5. The phenotype of the offspring indicated
by Box 3 would be
a. brown.
b. a mixture of brown and black.
c. black.
d. The phenotype cannot be
determined.
c. black
6. If an individual with a dominant phenotype is crossed with an
individual with a recessive phenotype, four of their nine offspring
show the recessive phenotype. What is the genotype of the first
parent?
a. AA
b. Aa
c. aa
d. The answer cannot be determined from this information.
b. Aa
7. If the genotype of an organism is YySsTt, then yST
would represent
a. the genotype of the offspring.
B. a possible phenotype of the offspring.
C. gamete of the parent.
D. possible zygote.
c. Gamete of the parent
8. A man with blood type AB could not be the father
of a child with
a. blood type A.
b. blood type B.
c. blood type AB.
d. blood type O.
d. Blood type O
9. Crossing a snapdragon that has red flowers with one
that has white flowers produces a snapdragon that has
pink flowers. The trait for flower color exhibits
a.
multiple alleles.
b.
incomplete dominance.
c.
complete dominance.
d.
codominance.
b. Incomplete dominance
10. What is the relationship between DNA, chromosomes, and
genes?
Chromosomes contain DNA and protein
DNA contains genes