BIO 182 Exam 2 2025 Questions and
Answers 100% Pass
In a simple Mendelian monohybrid cross, true-breeding tall plants are crossed
with short
plants, and the F1 plants, which are all tall, are allowed to self-pollinate. What
fraction of the F2 generation are both tall and heterozygous?
a. 1⁄8
b. 1⁄4
c. 1⁄3
d. 2⁄3
e. 1⁄2 - ANSWER-e. 1⁄2
The phenotype of an individual
a. depends at least in part on the genotype.
b. is either homozygous or heterozygous.
c. determines the genotype.
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,d. is the genetic constitution of the organism.
e. is either monohybrid or dihybrid. - ANSWER-a. depends at least in part on the
genotype.
The ABO blood groups in humans are determined by a multiple-allele system in
which IA and
IB are codominant and are both dominant to IO. A newborn infant is type A. The
mother is type
O. Possible phenotypes of the father are
a. A, B, or AB.
b. A, B, or O.
c. O only.
d. A or AB.
e. A or O - ANSWER-d. A or AB.
Which statement about an individual that is homozygous for an allele is not true?
a. Each of its cells possesses two copies of that allele.
b. Each of its gametes contains one copy of that allele.
c. It is true-breeding with respect to that allele.
d. Its parents were necessarily homozygous for that allele.
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, e. It can pass that allele to its offspring. - ANSWER-d. Its parents were necessarily
homozygous for that allele.
Which statement about a test cross is not true?
a. It tests whether an unknown individual is homozygous or heterozygous.
b. The test individual is crossed with a homozygous recessive individual.
c. If the test individual is heterozygous, the progeny will have a 1:1 ratio.
d. If the test individual is homozygous, the progeny will have a 3:1 ratio.
e. Test cross results are consistent with Mendel's model of inheritance for unlinked
genes - ANSWER-d. If the test individual is homozygous, the progeny will have a
3:1 ratio
Linked genes
a. must be immediately adjacent to one another on a chromosome.
b. have alleles that assort independently of one another.
c. never show crossing over.
d. are on the same chromosome.
e. always have multiple alleles. - ANSWER-d. are on the same chromosome.
In the F2 generation of a dihybrid cross
a. four phenotypes appear in the ratio 9:3:3:1 if the loci are linked.
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Answers 100% Pass
In a simple Mendelian monohybrid cross, true-breeding tall plants are crossed
with short
plants, and the F1 plants, which are all tall, are allowed to self-pollinate. What
fraction of the F2 generation are both tall and heterozygous?
a. 1⁄8
b. 1⁄4
c. 1⁄3
d. 2⁄3
e. 1⁄2 - ANSWER-e. 1⁄2
The phenotype of an individual
a. depends at least in part on the genotype.
b. is either homozygous or heterozygous.
c. determines the genotype.
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,d. is the genetic constitution of the organism.
e. is either monohybrid or dihybrid. - ANSWER-a. depends at least in part on the
genotype.
The ABO blood groups in humans are determined by a multiple-allele system in
which IA and
IB are codominant and are both dominant to IO. A newborn infant is type A. The
mother is type
O. Possible phenotypes of the father are
a. A, B, or AB.
b. A, B, or O.
c. O only.
d. A or AB.
e. A or O - ANSWER-d. A or AB.
Which statement about an individual that is homozygous for an allele is not true?
a. Each of its cells possesses two copies of that allele.
b. Each of its gametes contains one copy of that allele.
c. It is true-breeding with respect to that allele.
d. Its parents were necessarily homozygous for that allele.
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, e. It can pass that allele to its offspring. - ANSWER-d. Its parents were necessarily
homozygous for that allele.
Which statement about a test cross is not true?
a. It tests whether an unknown individual is homozygous or heterozygous.
b. The test individual is crossed with a homozygous recessive individual.
c. If the test individual is heterozygous, the progeny will have a 1:1 ratio.
d. If the test individual is homozygous, the progeny will have a 3:1 ratio.
e. Test cross results are consistent with Mendel's model of inheritance for unlinked
genes - ANSWER-d. If the test individual is homozygous, the progeny will have a
3:1 ratio
Linked genes
a. must be immediately adjacent to one another on a chromosome.
b. have alleles that assort independently of one another.
c. never show crossing over.
d. are on the same chromosome.
e. always have multiple alleles. - ANSWER-d. are on the same chromosome.
In the F2 generation of a dihybrid cross
a. four phenotypes appear in the ratio 9:3:3:1 if the loci are linked.
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