BSC2010 - Genetics Problems
Questions with Verified Answers
If a horticulturist breeding gardenias succeeds in having a single plant with a particularly
desirable set of traits, which of the following would be her most probable and efficient
route to
establishing a line of such plants?
A) Clone the plant.
B) Force the plant to self-pollinate to obtain an identical one.
C) Backtrack through her previous experiments to obtain another plant with the same
traits.
D) Breed this plant with another plant with much weaker traits. - ANSWERSA
Asexual reproduction occurs during which of the following processes?
A) the exchange of chromosomes between organisms of different species
B) meiosis
C) fertilization
D) mitosis - ANSWERSD
Quaking aspen trees can send out underground stems for asexual reproduction. Sexual
reproduction is not as common, but when it does happen, the haploid gametes have 19
chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9
B) 19
C) 10
D) 38 - ANSWERSD
Which of the following statements is correct in comparing sexual and asexual
reproduction?
A) Asexual reproduction produces only haploid offspring.
B) Asexual reproduction, but not sexual reproduction, is characteristic of only plants and
fungi.
C) In asexual reproduction, offspring are produced by fertilization without meiosis.
D) In sexual reproduction, individuals transmit half of their nuclear genes to each of their
offspring. - ANSWERSD
A triploid cell contains three sets of homologous chromosomes. If a cell of a diploid
species that
, normally has 42 chromosomes per cell is triploid, this cell would be expected to have
which of
the following sets of chromosomes?
A) 21 chromosome pairs and 21 unique chromosomes
B) 63 chromosomes, each with 3 sister chromatids
C) 63 chromosomes in 31 1/2 pairs
D) 63 chromosomes in 21 sets of 3 - ANSWERSD
(*) Which of the life cycles is typical for animals?
A) I only
B) II only
C) III only
D) I and III - ANSWERSA
If a cell has completed meiosis I and the first cytokinesis, and is just beginning meiosis
II, which
of the following is an appropriate description of its genetic contents?
A) It has half the amount of DNA as the cell that began meiosis.
B) It is genetically identical to another cell formed from the same meiosis I event.
C) It has half the chromosomes but twice the DNA of the parent cell.
D) It has one-fourth the DNA and one-half the chromosomes as the parent cell. -
ANSWERSA
Which of the following processes occurs in meiosis but not in mitosis?
A) alignment of chromosomes at the equator
B) synapsis of chromosomes
C) chromosome replication
D) condensation of chromosomes - ANSWERSB
(*) DNA was isolated from three different cell types of the same organism, the relative
DNA content for each type was
determined, and the results were plotted on the graph shown in the figure below. Refer
to the graph to answer the
following questions.
Which sample of DNA might represent an animal cell in the G2 phase of the cell cycle
prior to
meiosis?
A) I
B) II
C) III
D) both I and II - ANSWERSB
Questions with Verified Answers
If a horticulturist breeding gardenias succeeds in having a single plant with a particularly
desirable set of traits, which of the following would be her most probable and efficient
route to
establishing a line of such plants?
A) Clone the plant.
B) Force the plant to self-pollinate to obtain an identical one.
C) Backtrack through her previous experiments to obtain another plant with the same
traits.
D) Breed this plant with another plant with much weaker traits. - ANSWERSA
Asexual reproduction occurs during which of the following processes?
A) the exchange of chromosomes between organisms of different species
B) meiosis
C) fertilization
D) mitosis - ANSWERSD
Quaking aspen trees can send out underground stems for asexual reproduction. Sexual
reproduction is not as common, but when it does happen, the haploid gametes have 19
chromosomes. How many chromosomes are in the cells of the underground stems?
A) 9
B) 19
C) 10
D) 38 - ANSWERSD
Which of the following statements is correct in comparing sexual and asexual
reproduction?
A) Asexual reproduction produces only haploid offspring.
B) Asexual reproduction, but not sexual reproduction, is characteristic of only plants and
fungi.
C) In asexual reproduction, offspring are produced by fertilization without meiosis.
D) In sexual reproduction, individuals transmit half of their nuclear genes to each of their
offspring. - ANSWERSD
A triploid cell contains three sets of homologous chromosomes. If a cell of a diploid
species that
, normally has 42 chromosomes per cell is triploid, this cell would be expected to have
which of
the following sets of chromosomes?
A) 21 chromosome pairs and 21 unique chromosomes
B) 63 chromosomes, each with 3 sister chromatids
C) 63 chromosomes in 31 1/2 pairs
D) 63 chromosomes in 21 sets of 3 - ANSWERSD
(*) Which of the life cycles is typical for animals?
A) I only
B) II only
C) III only
D) I and III - ANSWERSA
If a cell has completed meiosis I and the first cytokinesis, and is just beginning meiosis
II, which
of the following is an appropriate description of its genetic contents?
A) It has half the amount of DNA as the cell that began meiosis.
B) It is genetically identical to another cell formed from the same meiosis I event.
C) It has half the chromosomes but twice the DNA of the parent cell.
D) It has one-fourth the DNA and one-half the chromosomes as the parent cell. -
ANSWERSA
Which of the following processes occurs in meiosis but not in mitosis?
A) alignment of chromosomes at the equator
B) synapsis of chromosomes
C) chromosome replication
D) condensation of chromosomes - ANSWERSB
(*) DNA was isolated from three different cell types of the same organism, the relative
DNA content for each type was
determined, and the results were plotted on the graph shown in the figure below. Refer
to the graph to answer the
following questions.
Which sample of DNA might represent an animal cell in the G2 phase of the cell cycle
prior to
meiosis?
A) I
B) II
C) III
D) both I and II - ANSWERSB
