BIOLOGY STUDY GUIDE TEST
QUESTIONS AND ANSWERS
A breed of chicken shows codominance for feather color. One allele codes for black
feathers, another codes for white feathers. The feathers of heterozygous chickens of
this breed will be...
A. Black.
B. White.
C. Gray.
D. Speckled. - ANSWER-D. Speckled.
Humans have different blood types, including AB, A, B, and O. Human blood type AB
is a trait that is the result of what pattern of inheritance?
A. Dominance
B. Codominance
C. Incomplete dominance
D. Sex-linked inheritance - ANSWER-B. Codominance
Some traits are polygenic. Examples of human traits that are polygenic are skin color
and height. What is a characteristic that could be used to describe all polygenic
traits?
A. They show a wide range of intermediate conditions between the extremes.
B. They appear more commonly in males than in females.
C They are controlled by a single set of alleles.
D. They cause diseases or disorders. - ANSWER-A. They show a wide range of
intermediate conditions between the extremes.
For some human traits, two possible alleles exist. For other traits, multiple (more
than two) alleles for the trait are present in the population. Which of the following is
an example of a trait controlled by multiple alleles?
A. Left- or right-handedness
B. Blood type
C. Hemophilia
D. Color blindness - ANSWER-D. Color blindness
If a man with blood type A and a woman with blood type B produce an offspring,
what will not be the possible offspring's blood type?
A. AB or O
B. A, B, or O
C. A, B, AB, or O
D. AB only - ANSWER-A. AB or O
, Male hamsters with red fur are crossed with female hamsters with white fur. Both
male and female offspring have coats with a combination of red and white fur. Which
of the following BEST describes the genetics of this situation?
A. The red and white alleles are co-dominant.
B. The red and white alleles are sex-linked.
C. The red allele is dominant to the white allele.
D. The red allele is recessive to the white allele. - ANSWER-A. The red and white
alleles are co-dominant.
Huntington's disease is a disorder caused by a genetic defect. A parent with the
abnormal gene for Huntington's disease has a 50% chance of passing on the gene
to each of his or her children. Each child's risk is independent of whether a sibling
has the disorder. This disease is an example of which of the following kinds of
inheritance?
A. Autosomal dominant inheritance
B. Autosomal recessive inheritance
C. Sex-linked inheritance
D. Mitochondrial inheritance - ANSWER-A. Autosomal dominant inheritance
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two
heterozygous tall plants are crossed, what percentage of the offspring would be
expected to have the same phenotype as the parents?
A. 100%
B. 75%
C. 50%
D. 25% - ANSWER-B. 75%
Hemophilia is a sex-linked, recessive trait. Which of the following describes the
probability of hemophilia in the offspring of a man who does not have hemophilia and
a woman whose father is a hemophiliac?
A. Each of their sons will have hemophilia.
B. None of their daughters will have hemophilia.
C. Their sons have a 50% chance of having hemophilia.
D. There is a 50% chance that their daughters will have hemophilia. - ANSWER-B.
None of their daughters will have hemophilia.
C. Their sons have a 50% chance of having hemophilia.
Situations in which one allele for a gene is not completely dominant over another
allele for that gene and results in a third phenotype between the two extremes are
called...
A. Multiple alleles.
B. Incomplete dominance.
C. Polygenic inheritance.
D. Multiple genes. - ANSWER-B. Incomplete dominance.
QUESTIONS AND ANSWERS
A breed of chicken shows codominance for feather color. One allele codes for black
feathers, another codes for white feathers. The feathers of heterozygous chickens of
this breed will be...
A. Black.
B. White.
C. Gray.
D. Speckled. - ANSWER-D. Speckled.
Humans have different blood types, including AB, A, B, and O. Human blood type AB
is a trait that is the result of what pattern of inheritance?
A. Dominance
B. Codominance
C. Incomplete dominance
D. Sex-linked inheritance - ANSWER-B. Codominance
Some traits are polygenic. Examples of human traits that are polygenic are skin color
and height. What is a characteristic that could be used to describe all polygenic
traits?
A. They show a wide range of intermediate conditions between the extremes.
B. They appear more commonly in males than in females.
C They are controlled by a single set of alleles.
D. They cause diseases or disorders. - ANSWER-A. They show a wide range of
intermediate conditions between the extremes.
For some human traits, two possible alleles exist. For other traits, multiple (more
than two) alleles for the trait are present in the population. Which of the following is
an example of a trait controlled by multiple alleles?
A. Left- or right-handedness
B. Blood type
C. Hemophilia
D. Color blindness - ANSWER-D. Color blindness
If a man with blood type A and a woman with blood type B produce an offspring,
what will not be the possible offspring's blood type?
A. AB or O
B. A, B, or O
C. A, B, AB, or O
D. AB only - ANSWER-A. AB or O
, Male hamsters with red fur are crossed with female hamsters with white fur. Both
male and female offspring have coats with a combination of red and white fur. Which
of the following BEST describes the genetics of this situation?
A. The red and white alleles are co-dominant.
B. The red and white alleles are sex-linked.
C. The red allele is dominant to the white allele.
D. The red allele is recessive to the white allele. - ANSWER-A. The red and white
alleles are co-dominant.
Huntington's disease is a disorder caused by a genetic defect. A parent with the
abnormal gene for Huntington's disease has a 50% chance of passing on the gene
to each of his or her children. Each child's risk is independent of whether a sibling
has the disorder. This disease is an example of which of the following kinds of
inheritance?
A. Autosomal dominant inheritance
B. Autosomal recessive inheritance
C. Sex-linked inheritance
D. Mitochondrial inheritance - ANSWER-A. Autosomal dominant inheritance
In pea plants, the trait for tall stems is dominant over the trait for short stems. If two
heterozygous tall plants are crossed, what percentage of the offspring would be
expected to have the same phenotype as the parents?
A. 100%
B. 75%
C. 50%
D. 25% - ANSWER-B. 75%
Hemophilia is a sex-linked, recessive trait. Which of the following describes the
probability of hemophilia in the offspring of a man who does not have hemophilia and
a woman whose father is a hemophiliac?
A. Each of their sons will have hemophilia.
B. None of their daughters will have hemophilia.
C. Their sons have a 50% chance of having hemophilia.
D. There is a 50% chance that their daughters will have hemophilia. - ANSWER-B.
None of their daughters will have hemophilia.
C. Their sons have a 50% chance of having hemophilia.
Situations in which one allele for a gene is not completely dominant over another
allele for that gene and results in a third phenotype between the two extremes are
called...
A. Multiple alleles.
B. Incomplete dominance.
C. Polygenic inheritance.
D. Multiple genes. - ANSWER-B. Incomplete dominance.
