ANSC 221- EXAM 3 QUESTIONS AND ANSWERS
In which phase of the cell cycle does the cell divide? - Answers -M Phase
If two chromosomes are homologous, they
a. Look similar under the microscope
b. Have very similar DNA sequences
c. Carry the same type of genes
d. All of the Above - Answers -All of the above
Which of the following is a reason for meiotic division?
a. asexual reproduction
b. gamete formation in animals
c. multicelluarity
d. all of the above
e. both a and c - Answers -b. gamete formation in animals
A replicated chromosome is composed of - Answers -two sister chromatids held
together by centromere
Prophase mitosis - Answers -The nuclear envelope begins to break down is part of
what phase
Which of the following statements accurately describes a difference between mitosis
and meiosis?
a. Mitosis may produce diploid cell, whereas meiosis produces haploid cells."
b. Homologous chromosome synapse during meiosis but do not synapse during
mitosis-.
c. Crossing over commonly occurs during meiosis but it does not commonly occur
during mitosis..
d. All of the aboveare correct.
e. Both a and c are correct. - Answers -All of the above
During crossing over in meiosis I,
a. homologous chromosomes are not altered
b. homologous chromosomes exchange genetic material
c. chromosomal damage occurs
d. some genetic information is lost.
e. cytokinesis occurs - Answers -homologous chromosomes exchange genetic material
Down syndrome is a chromosomal disorder caused by the presence of all or part of an
extra 21st chromosome. This is an example of ...
a. euploidy
b. polyplody
c. monosomy
, d. aneuploidy
e. all of the above - Answers -aneuploidy
During which phase of cellular division does Mendel's law of segregation physically
occur?
a. mitosis
b. meiosis I
c. meiosis II
d. all of the above
e. b and c only - Answers -Meiosis 1
An individual that has the same allele of a gene on both chromosomes is said to be ...
a. dihybrid
b. recessive
c. homozygous
d. heterzygous
e. hemizygous - Answers -homozygous
Which of Mendel's law cannot be observed in a monohybrid cross?
a. segregation
b. dominance/recessiveness
c. independent assortment
d. codominance
e. all of the above - Answers -independent assortment
How many types of gametes can be produced by an individual with the genotype
AaBbCCddEEff?
a. 4
b. 8
c. 16
d. 32
e. 64 - Answers -4
Based on Mendel's experimental crosses, what is the expected F2 phenotype ratio of a
cross between two individuals that are both heterozygous for two independently
assorting genes?
a. 1:2:3
b. 2:1
c. 3:1
d. 9:3:3:1
e. 4:1 - Answers -D
During a _____ cross, an individual with the dominant phenotype and unknown
genotype is crossed with a ____ individual to determine the unknown genotype. -
Answers -test, homozygous recessive
In which phase of the cell cycle does the cell divide? - Answers -M Phase
If two chromosomes are homologous, they
a. Look similar under the microscope
b. Have very similar DNA sequences
c. Carry the same type of genes
d. All of the Above - Answers -All of the above
Which of the following is a reason for meiotic division?
a. asexual reproduction
b. gamete formation in animals
c. multicelluarity
d. all of the above
e. both a and c - Answers -b. gamete formation in animals
A replicated chromosome is composed of - Answers -two sister chromatids held
together by centromere
Prophase mitosis - Answers -The nuclear envelope begins to break down is part of
what phase
Which of the following statements accurately describes a difference between mitosis
and meiosis?
a. Mitosis may produce diploid cell, whereas meiosis produces haploid cells."
b. Homologous chromosome synapse during meiosis but do not synapse during
mitosis-.
c. Crossing over commonly occurs during meiosis but it does not commonly occur
during mitosis..
d. All of the aboveare correct.
e. Both a and c are correct. - Answers -All of the above
During crossing over in meiosis I,
a. homologous chromosomes are not altered
b. homologous chromosomes exchange genetic material
c. chromosomal damage occurs
d. some genetic information is lost.
e. cytokinesis occurs - Answers -homologous chromosomes exchange genetic material
Down syndrome is a chromosomal disorder caused by the presence of all or part of an
extra 21st chromosome. This is an example of ...
a. euploidy
b. polyplody
c. monosomy
, d. aneuploidy
e. all of the above - Answers -aneuploidy
During which phase of cellular division does Mendel's law of segregation physically
occur?
a. mitosis
b. meiosis I
c. meiosis II
d. all of the above
e. b and c only - Answers -Meiosis 1
An individual that has the same allele of a gene on both chromosomes is said to be ...
a. dihybrid
b. recessive
c. homozygous
d. heterzygous
e. hemizygous - Answers -homozygous
Which of Mendel's law cannot be observed in a monohybrid cross?
a. segregation
b. dominance/recessiveness
c. independent assortment
d. codominance
e. all of the above - Answers -independent assortment
How many types of gametes can be produced by an individual with the genotype
AaBbCCddEEff?
a. 4
b. 8
c. 16
d. 32
e. 64 - Answers -4
Based on Mendel's experimental crosses, what is the expected F2 phenotype ratio of a
cross between two individuals that are both heterozygous for two independently
assorting genes?
a. 1:2:3
b. 2:1
c. 3:1
d. 9:3:3:1
e. 4:1 - Answers -D
During a _____ cross, an individual with the dominant phenotype and unknown
genotype is crossed with a ____ individual to determine the unknown genotype. -
Answers -test, homozygous recessive
