GENETICS PCB 3063 PRACTICE EXAMS
|124 QUESTIONS WITH 100% VERIFIED
ANSWERS
Draw all of its chromosomes condensed at the end of mitotic prophase in the circle to
the right: - CORRECT ANSWER - 4 chromosomes
each is a duplicated chromosome
Draw all of the chromosomes in one of its daughter cells at the end of mitosis
in the circle below: - CORRECT ANSWER - 4 chromosomes
not duplicated
Draw all of the chromosomes in one of its daughter cells at the end of meiosis in the
circle below: - CORRECT ANSWER - 2 chromos
not duplicated
One way that prokaryotic cells differ from eukaryotic cells is that only prokaryotic cells
contain
A) alleles.
B) a single circular chromosome.
C) spindle microtubules.
D) an origin of replication.
E) homologous chromosomes. - CORRECT ANSWER - a single circular chromosome.
During cell division spindle microtubules attach to the kinetochore, which is located at
the ________ of a chromosome.
A) telomere
B) centromere
C) centrosome
D) histone
E) origin of replication - CORRECT ANSWER - B) centromere
______________ the M phase (mitosis).
A) DNA synthesis occurs only during
B) Crossing over occurs only in prophase of C) Haploid cells are produced by
D) The shortest phase of the cell cycle is
E) Cells grow in size during - CORRECT ANSWER - D) The shortest phase of the cell
cycle is
Cohesins join sister chromatids together during A) mitosis, but not meiosis.
B) meiosis I and meiosis II, but not mitosis.
C) meiosis I only.
,D) meiosis II only.
E) mitosis and meiosis I, but not meiosis II. - CORRECT ANSWER - E) mitosis and
meiosis I, but not meiosis II.
A dividing eukaryotic cell is treated with a drug that inhibits shortening of spindle
microtubules. This will cause the cell division cycle to stop at the ______ stage.
A) G1.
B) S
C) metaphase
D) telophase
E) G2 - CORRECT ANSWER - C) metaphase
The fruit fly has four pairs of chromosomes, whereas the house fly has six pairs of
chromosomes. In which species would you expect to see more genetic variation among
the progeny of a cross?
A) fruit fly, because 24 possible combinations of chromosomes in the progeny.
B) house fly, because 26 possible combinations of chromosomes in the progeny.
C) fruit fly, because 28 possible combinations of chromosomes in the progeny.
D) house fly, because 212 possible combinations of chromosomes in the progeny.
E) fruit fly, because 42 possible combinations of chromosomes in the progeny. -
CORRECT ANSWER - B) house fly, because 26 possible combinations of
chromosomes in the progeny.
Gametogenesis in a horse with a diploid number of 64 will produce
A) haploid cells with 32 chromosomes.
B) haploid cells with 64 chromosomes.
C) diploid cells with 32 chromosomes.
D) diploid cells with 64 chromosomes.
E) identical cells with 128 chromosomes. - CORRECT ANSWER - A) haploid cells with
32 chromosomes.
The set of alleles within an individual is its
A) phenotype
B) genotype
C) karyotype
D) haploid number E) A & C - CORRECT ANSWER - B) genotype
Geneticist use the rule of multiplication to predict
A) the probability that two independent events will both occur.
B) the probability that one or the other of two independent events will occur. C) the total
number of offspring from a cross.
D) the total number of chromosomes at the end of mitosis.
, E) B & C - CORRECT ANSWER - A) the probability that two independent events will
both occur.
Mendel's Principle of Segregation applies to which chromosome behavior during cell
division?
A) Arrangement of chromosomes along metaphase plate of mitosis B) Alignment of
homologous chromosomes during prophase I
C) Separation of sister chromatids during meiosis I
D) Duplication of chromosomes during S phase
E) Separation of homologous chromosomes during meiosis I - CORRECT ANSWER -
E) Separation of homologous chromosomes during meiosis I
In cucumbers, green fruit color (G) is dominant over white fruit color (g). A cross
between a homozygous green plant and a homozygous white plant produces F1
hybrids. The F1 plants are self-crossed to produce F2 plants with a genotypic ratio of
A) 3 green : 1 white
B) 1 GG : 2 Gg : 1 gg
C) 1 green : 1 white
D) 3 GG : 1 gg
E) 1 GG : 1 Gg - CORRECT ANSWER - B) 1 GG : 2 Gg : 1 gg
Which of the following statements is TRUE?
A) A testcross is when an unknown genotype is crossed to either one of its parents. B)
The probability of two independent events occurring together is calculated by adding
their independent probabilities.
C) The probability of a woman giving birth to four boys in a row is 1/16.
D) The probability of a litter of three puppies all being male is 1/3.
E) None of these statements is true. - CORRECT ANSWER - C) The probability of a
woman giving birth to four boys in a row is 1/16.
When a true-breeding tall pea plant (TT) and a true-breeding short pea plant (tt) are
crossed, tall F1 plants are produced. What phenotypic ratio will be produced in the
progeny when an F1 plant is testcrossed?
A) 3 tall : 1 short
B) 3 Tt : 1 tt
C) 1 TT : 2 Tt : 1 tt
D) 1 tall : 1 short
E) all tall - CORRECT ANSWER - D) 1 tall : 1 short
In cats, a curled ears allele (E) is dominant over normal ears (e). Black fur results from
an independently assorting allele (G) that is dominant over an allele for gray fur (g).
When a male gray cat with normal ears mates with a female black cat with curled ears,
|124 QUESTIONS WITH 100% VERIFIED
ANSWERS
Draw all of its chromosomes condensed at the end of mitotic prophase in the circle to
the right: - CORRECT ANSWER - 4 chromosomes
each is a duplicated chromosome
Draw all of the chromosomes in one of its daughter cells at the end of mitosis
in the circle below: - CORRECT ANSWER - 4 chromosomes
not duplicated
Draw all of the chromosomes in one of its daughter cells at the end of meiosis in the
circle below: - CORRECT ANSWER - 2 chromos
not duplicated
One way that prokaryotic cells differ from eukaryotic cells is that only prokaryotic cells
contain
A) alleles.
B) a single circular chromosome.
C) spindle microtubules.
D) an origin of replication.
E) homologous chromosomes. - CORRECT ANSWER - a single circular chromosome.
During cell division spindle microtubules attach to the kinetochore, which is located at
the ________ of a chromosome.
A) telomere
B) centromere
C) centrosome
D) histone
E) origin of replication - CORRECT ANSWER - B) centromere
______________ the M phase (mitosis).
A) DNA synthesis occurs only during
B) Crossing over occurs only in prophase of C) Haploid cells are produced by
D) The shortest phase of the cell cycle is
E) Cells grow in size during - CORRECT ANSWER - D) The shortest phase of the cell
cycle is
Cohesins join sister chromatids together during A) mitosis, but not meiosis.
B) meiosis I and meiosis II, but not mitosis.
C) meiosis I only.
,D) meiosis II only.
E) mitosis and meiosis I, but not meiosis II. - CORRECT ANSWER - E) mitosis and
meiosis I, but not meiosis II.
A dividing eukaryotic cell is treated with a drug that inhibits shortening of spindle
microtubules. This will cause the cell division cycle to stop at the ______ stage.
A) G1.
B) S
C) metaphase
D) telophase
E) G2 - CORRECT ANSWER - C) metaphase
The fruit fly has four pairs of chromosomes, whereas the house fly has six pairs of
chromosomes. In which species would you expect to see more genetic variation among
the progeny of a cross?
A) fruit fly, because 24 possible combinations of chromosomes in the progeny.
B) house fly, because 26 possible combinations of chromosomes in the progeny.
C) fruit fly, because 28 possible combinations of chromosomes in the progeny.
D) house fly, because 212 possible combinations of chromosomes in the progeny.
E) fruit fly, because 42 possible combinations of chromosomes in the progeny. -
CORRECT ANSWER - B) house fly, because 26 possible combinations of
chromosomes in the progeny.
Gametogenesis in a horse with a diploid number of 64 will produce
A) haploid cells with 32 chromosomes.
B) haploid cells with 64 chromosomes.
C) diploid cells with 32 chromosomes.
D) diploid cells with 64 chromosomes.
E) identical cells with 128 chromosomes. - CORRECT ANSWER - A) haploid cells with
32 chromosomes.
The set of alleles within an individual is its
A) phenotype
B) genotype
C) karyotype
D) haploid number E) A & C - CORRECT ANSWER - B) genotype
Geneticist use the rule of multiplication to predict
A) the probability that two independent events will both occur.
B) the probability that one or the other of two independent events will occur. C) the total
number of offspring from a cross.
D) the total number of chromosomes at the end of mitosis.
, E) B & C - CORRECT ANSWER - A) the probability that two independent events will
both occur.
Mendel's Principle of Segregation applies to which chromosome behavior during cell
division?
A) Arrangement of chromosomes along metaphase plate of mitosis B) Alignment of
homologous chromosomes during prophase I
C) Separation of sister chromatids during meiosis I
D) Duplication of chromosomes during S phase
E) Separation of homologous chromosomes during meiosis I - CORRECT ANSWER -
E) Separation of homologous chromosomes during meiosis I
In cucumbers, green fruit color (G) is dominant over white fruit color (g). A cross
between a homozygous green plant and a homozygous white plant produces F1
hybrids. The F1 plants are self-crossed to produce F2 plants with a genotypic ratio of
A) 3 green : 1 white
B) 1 GG : 2 Gg : 1 gg
C) 1 green : 1 white
D) 3 GG : 1 gg
E) 1 GG : 1 Gg - CORRECT ANSWER - B) 1 GG : 2 Gg : 1 gg
Which of the following statements is TRUE?
A) A testcross is when an unknown genotype is crossed to either one of its parents. B)
The probability of two independent events occurring together is calculated by adding
their independent probabilities.
C) The probability of a woman giving birth to four boys in a row is 1/16.
D) The probability of a litter of three puppies all being male is 1/3.
E) None of these statements is true. - CORRECT ANSWER - C) The probability of a
woman giving birth to four boys in a row is 1/16.
When a true-breeding tall pea plant (TT) and a true-breeding short pea plant (tt) are
crossed, tall F1 plants are produced. What phenotypic ratio will be produced in the
progeny when an F1 plant is testcrossed?
A) 3 tall : 1 short
B) 3 Tt : 1 tt
C) 1 TT : 2 Tt : 1 tt
D) 1 tall : 1 short
E) all tall - CORRECT ANSWER - D) 1 tall : 1 short
In cats, a curled ears allele (E) is dominant over normal ears (e). Black fur results from
an independently assorting allele (G) that is dominant over an allele for gray fur (g).
When a male gray cat with normal ears mates with a female black cat with curled ears,
