BIOLOGY 101 QUESTIONS AND
ANSWERS ALL CORRECT
Which of the following is a characteristic seen in prophase I that does NOT occur in
prophase II?
A. chromosomes move to the middle of the cell
B. spindle formation occurs
C. crossing over occurs
D. chromosomes line up in the middle of the cell - Answer- C
What is the difference between a benign and a malignant tumor?
A. benign tumors do not metastasize; malignant tumors do
B. benign tumors are composed of cancer cells; malignant tumors are not
C. benign tumors are not the result of a failure of a cell cycle control system; malignant
tumors are
D. benign tumors do not form lumps; malignant tumors do form lumps - Answer- A
Genetic variation is accomplished by all but one of the following. Choose the exception.
A. independent assortment
B. the events in meiosis I
C. crossing over
D. the events in meiosis II - Answer- D
Examine the figure below. Nucleosomes are made of
A. RNA and protein
B. DNA and histone proteins
C. proteins
D. DNA - Answer- B
During telophase
A. chromosomes line up in the middle of the cell
B. the events of prophase are reversed
C. the nuclear envelope breaks up
D. sister chromatids become separate chromosomes - Answer- B
Chromatid consists of
A. DNA and protein
B. protein only
C. RNA and protein
, D. DNA only - Answer- A
A purebred plant the produces yellow seeds is crossed with a purebred plant that
produces green seeds. The seeds of all the offspring are yellow. Why?
A. the alleles are codominant
B. the yellow allele is dominant to the green allele
C. the yellow allele is recessive to the green allele
D. all of the offspring are homzygous yellow - Answer- B
To determine the phenotype of an individual who expresses a dominant trait, you would
cross that individual with an individual who
A. a homozygous dominant for that trait
B. expresses the dominant trait
C. is heterozygous for that trait
D. is homozygous recessive for that trait - Answer- D
An individual who is homozygous
A. expresses the recessive trait
B. carries two copies of the same allele for a gene
C. expresses the dominant trait
D. carries two different alleles for a gene - Answer- B
Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a
dominant allele. It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family. Notice that some
individuals (shown in grey) have a widow's peak (W=dominant allele w=recessive allele)
- Answer- Widow's Peak Pedigree
This pedigree supports that fact that widow's peak is due to a dominant allele, because
if it were due to a recessive allele and both parents show the recessive phenotype, then
A. half of the sons would have a widow's peak
B. all of the daughters and non of the sons would have a widow's peak
C. none of the daughters would have a widow's peak
D. all of the offspring would have a widow's peak - Answer- D
What is key to recognition of a trait whose expression is determined by the effects of
two more more genes (polygenic information)
A. a mating between a homozygous and a heterzygoud individual produces more than
the expected number of offspring expressing the dominant trait
B. pleiotrophy occurs
C. the trait varies along a continuum in the population
D. all of the alleles of the genes for that trait are equally expressed/ - Answer- C
What name is given to the specific location of a gene on a chromosome?
A. phenotype
B. locus
ANSWERS ALL CORRECT
Which of the following is a characteristic seen in prophase I that does NOT occur in
prophase II?
A. chromosomes move to the middle of the cell
B. spindle formation occurs
C. crossing over occurs
D. chromosomes line up in the middle of the cell - Answer- C
What is the difference between a benign and a malignant tumor?
A. benign tumors do not metastasize; malignant tumors do
B. benign tumors are composed of cancer cells; malignant tumors are not
C. benign tumors are not the result of a failure of a cell cycle control system; malignant
tumors are
D. benign tumors do not form lumps; malignant tumors do form lumps - Answer- A
Genetic variation is accomplished by all but one of the following. Choose the exception.
A. independent assortment
B. the events in meiosis I
C. crossing over
D. the events in meiosis II - Answer- D
Examine the figure below. Nucleosomes are made of
A. RNA and protein
B. DNA and histone proteins
C. proteins
D. DNA - Answer- B
During telophase
A. chromosomes line up in the middle of the cell
B. the events of prophase are reversed
C. the nuclear envelope breaks up
D. sister chromatids become separate chromosomes - Answer- B
Chromatid consists of
A. DNA and protein
B. protein only
C. RNA and protein
, D. DNA only - Answer- A
A purebred plant the produces yellow seeds is crossed with a purebred plant that
produces green seeds. The seeds of all the offspring are yellow. Why?
A. the alleles are codominant
B. the yellow allele is dominant to the green allele
C. the yellow allele is recessive to the green allele
D. all of the offspring are homzygous yellow - Answer- B
To determine the phenotype of an individual who expresses a dominant trait, you would
cross that individual with an individual who
A. a homozygous dominant for that trait
B. expresses the dominant trait
C. is heterozygous for that trait
D. is homozygous recessive for that trait - Answer- D
An individual who is homozygous
A. expresses the recessive trait
B. carries two copies of the same allele for a gene
C. expresses the dominant trait
D. carries two different alleles for a gene - Answer- B
Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a
dominant allele. It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family. Notice that some
individuals (shown in grey) have a widow's peak (W=dominant allele w=recessive allele)
- Answer- Widow's Peak Pedigree
This pedigree supports that fact that widow's peak is due to a dominant allele, because
if it were due to a recessive allele and both parents show the recessive phenotype, then
A. half of the sons would have a widow's peak
B. all of the daughters and non of the sons would have a widow's peak
C. none of the daughters would have a widow's peak
D. all of the offspring would have a widow's peak - Answer- D
What is key to recognition of a trait whose expression is determined by the effects of
two more more genes (polygenic information)
A. a mating between a homozygous and a heterzygoud individual produces more than
the expected number of offspring expressing the dominant trait
B. pleiotrophy occurs
C. the trait varies along a continuum in the population
D. all of the alleles of the genes for that trait are equally expressed/ - Answer- C
What name is given to the specific location of a gene on a chromosome?
A. phenotype
B. locus
