ANSC 221 PRACTICE EXAM QUESTIONS
WITH CORRECT ANSWERS
Which of the following is not an event of anaphase of mitosis? - Answer-The nuclear
envelope breaks 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 replicated
chromosomes (sister chromatids) aligned at the metaphase plate of the cell. Which of
the following statements accurately describes this particular cell? - Answer-The cell is in
metaphase of meiosis II.
Which of the following statements accurately describes a difference between mitosis
and meiosis? - Answer-All of the above are correct.
During which phase of cellular division does Mendel s law of segregation physically
occur? - Answer-meiosis I
During crossing over in meiosis I, - Answer-homologous chromosomes exchange
genetic material.
A mutation in which most of the protein coding sequence of the gene is removed is most
likely to be which type of allele? - Answer-Loss of Function
Which of the following statements about a lethal allele is NOT correct? - Answer-Lethal
alleles are always recessive.
Sarah has chronic bronchitis and frequently ends up hospitalized with pneumonia. She
has no family history of cystic fibrosis, a serious recessive genetic disorder which
affects the respiratory and digestive tracts. She and her husband, Greg, have one child
after undergoing fertility treatments to overcome Greg's infertility. They are surprised
when the child is diagnosed with cystic fibrosis and the genetic counselor tells them that
they each also have the condition, which causes their bronchitis and infertility. Which of
the following explanations would be a reasonable explanation of their situation? -
Answer-All of the Above
The recessive mutant allele that causes cystic fibrosis is much more frequent in
Caucasians of eastern European descent than in other populations. Some scientists
believe heterozygotes must have had a survival advantage during plagues such as
, cholera that occasionally swept through this population. What concept does this
illustrate? - Answer-overdominance
What are the possible offspring from a type A mother and a type AB father? - Answer-A,
B, and AB
Neurofibromatosis is a condition in humans which is generally inherited in a dominant
fashion. Assuming this disorder is 90% penetrant, what is the chance that a single child
born to a father with neurofibromatosis and a mother known not to carry the mutation
will have the disorder? - Answer-45%
A trait that appears to be dominant in one sex but recessive in the other is called: -
Answer-A sex influenced trait
Lethal alleles violate the rules of Mendelian inheritance. - Answer-False
Sex-limited inheritance refers to traits that are located on the X or Y chromosome. -
Answer-False
Genes on the X or Y chromosomes in humans are NOT always inherited in a different
pattern than are genes on the autosomes. - Answer-True
The human genome contains more than 3.4 billion base pairs and between 50,000 and
55,000 genes. - Answer-false
The U.S. Department of Energy Human Genome Project Information Web site illustrates
the size of the human genome by estimating that it would take "about 9.5 years to read
out loud (without stopping) the more than three billion pairs of bases in one person's
genome sequence". - Answer-True
_________ of proteins is performed by _________ within the cytosol of eukaryotic cells.
- Answer-translation, ribosomes
The _________ is the region of a eukaryotic cell that is outside the cell organelles but
inside the plasma membrane. - Answer-cytosol
The ________ is a network of three different types of protein filaments that are
responsible for eukaryotic cell structure and shape, organization of organelles,
intracellular movement of macromolecules and cell movement. - Answer-cytoskeleton
Each of the following is an integral part of the endomembrane system except - Answer-
mitchondria
The nuclear membrane is a single-membrane structure in prokaryotes and a double-
membrane structure in eukaryotes. - Answer-false
WITH CORRECT ANSWERS
Which of the following is not an event of anaphase of mitosis? - Answer-The nuclear
envelope breaks 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 replicated
chromosomes (sister chromatids) aligned at the metaphase plate of the cell. Which of
the following statements accurately describes this particular cell? - Answer-The cell is in
metaphase of meiosis II.
Which of the following statements accurately describes a difference between mitosis
and meiosis? - Answer-All of the above are correct.
During which phase of cellular division does Mendel s law of segregation physically
occur? - Answer-meiosis I
During crossing over in meiosis I, - Answer-homologous chromosomes exchange
genetic material.
A mutation in which most of the protein coding sequence of the gene is removed is most
likely to be which type of allele? - Answer-Loss of Function
Which of the following statements about a lethal allele is NOT correct? - Answer-Lethal
alleles are always recessive.
Sarah has chronic bronchitis and frequently ends up hospitalized with pneumonia. She
has no family history of cystic fibrosis, a serious recessive genetic disorder which
affects the respiratory and digestive tracts. She and her husband, Greg, have one child
after undergoing fertility treatments to overcome Greg's infertility. They are surprised
when the child is diagnosed with cystic fibrosis and the genetic counselor tells them that
they each also have the condition, which causes their bronchitis and infertility. Which of
the following explanations would be a reasonable explanation of their situation? -
Answer-All of the Above
The recessive mutant allele that causes cystic fibrosis is much more frequent in
Caucasians of eastern European descent than in other populations. Some scientists
believe heterozygotes must have had a survival advantage during plagues such as
, cholera that occasionally swept through this population. What concept does this
illustrate? - Answer-overdominance
What are the possible offspring from a type A mother and a type AB father? - Answer-A,
B, and AB
Neurofibromatosis is a condition in humans which is generally inherited in a dominant
fashion. Assuming this disorder is 90% penetrant, what is the chance that a single child
born to a father with neurofibromatosis and a mother known not to carry the mutation
will have the disorder? - Answer-45%
A trait that appears to be dominant in one sex but recessive in the other is called: -
Answer-A sex influenced trait
Lethal alleles violate the rules of Mendelian inheritance. - Answer-False
Sex-limited inheritance refers to traits that are located on the X or Y chromosome. -
Answer-False
Genes on the X or Y chromosomes in humans are NOT always inherited in a different
pattern than are genes on the autosomes. - Answer-True
The human genome contains more than 3.4 billion base pairs and between 50,000 and
55,000 genes. - Answer-false
The U.S. Department of Energy Human Genome Project Information Web site illustrates
the size of the human genome by estimating that it would take "about 9.5 years to read
out loud (without stopping) the more than three billion pairs of bases in one person's
genome sequence". - Answer-True
_________ of proteins is performed by _________ within the cytosol of eukaryotic cells.
- Answer-translation, ribosomes
The _________ is the region of a eukaryotic cell that is outside the cell organelles but
inside the plasma membrane. - Answer-cytosol
The ________ is a network of three different types of protein filaments that are
responsible for eukaryotic cell structure and shape, organization of organelles,
intracellular movement of macromolecules and cell movement. - Answer-cytoskeleton
Each of the following is an integral part of the endomembrane system except - Answer-
mitchondria
The nuclear membrane is a single-membrane structure in prokaryotes and a double-
membrane structure in eukaryotes. - Answer-false
