ANSC 221 Questions with Verified Correct Answer
If two chromosomes are homologous, they
a. look similar under a microscope.
b. have very similar DNA sequences.
c. carry the same types of genes.
d. may carry different versions of the same gene.
E. are all of the above
Which of the following is an event of prophase of mitosis
The nuclear envelope begins to break down.
A student is looking at cells under the microscope. The cells are from an organism that has
a diploid number of 14. In one particular case, the cell has seven pairs of homologous
replicated chromosomes aligned at the metaphase plate of the cell. Which of the following
statements accurately describes this particular cell?
The cell is in metaphase of meiosis II
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 chromosomes 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 above are correct.
, During crossing over in meiosis I,
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
aneuploidy.
What is the probability of the 1st offspring being agouti, a 2nd offspring being black and a
3rd being albino?
3/128
What is the probability that among the first six offspring, two will be black, two will be
agouti, and two will be albino? (Hint: this should be done using the multinomial equation).
4.9%
Fruit shape in squash can be either disc, sphere, or long. Below are the results from three
crosses.
Cross Phenotypes of parents Phenotypes of Offspring
A disc x disc 9/16 disc, 6/16 sphere, 1/16 long
B long x disc 1/4 disc, 1/2 sphere, 1/4 long
C sphere x long 1/2 sphere, 1/2 long
...
What is the most likely genotype of the parents in cross A?
If two chromosomes are homologous, they
a. look similar under a microscope.
b. have very similar DNA sequences.
c. carry the same types of genes.
d. may carry different versions of the same gene.
E. are all of the above
Which of the following is an event of prophase of mitosis
The nuclear envelope begins to break down.
A student is looking at cells under the microscope. The cells are from an organism that has
a diploid number of 14. In one particular case, the cell has seven pairs of homologous
replicated chromosomes aligned at the metaphase plate of the cell. Which of the following
statements accurately describes this particular cell?
The cell is in metaphase of meiosis II
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 chromosomes 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 above are correct.
, During crossing over in meiosis I,
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
aneuploidy.
What is the probability of the 1st offspring being agouti, a 2nd offspring being black and a
3rd being albino?
3/128
What is the probability that among the first six offspring, two will be black, two will be
agouti, and two will be albino? (Hint: this should be done using the multinomial equation).
4.9%
Fruit shape in squash can be either disc, sphere, or long. Below are the results from three
crosses.
Cross Phenotypes of parents Phenotypes of Offspring
A disc x disc 9/16 disc, 6/16 sphere, 1/16 long
B long x disc 1/4 disc, 1/2 sphere, 1/4 long
C sphere x long 1/2 sphere, 1/2 long
...
What is the most likely genotype of the parents in cross A?
