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Genetics PCB 3063 Practice Exams
Questions And Answers (Guaranteed A+)
Draw all of its chromosomes condensed at the end of mitotic prophase in the circle to the right: -
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: - 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: - 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. - 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 - Answer✔B) centromere
______________ the M phase (mitosis).
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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 - 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. - 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 - 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. - 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.
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D) diploid cells with 64 chromosomes.
E) identical cells with 128 chromosomes. - 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 - 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 - 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 - 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 - Answer✔B) 1 GG : 2 Gg : 1 gg
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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. - 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 - 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, all 14 of the kittens
have black fur and 7 have curled ears. When the same female mates with a stray black cat with
normal ears, what would you expect to see in this second litter of kittens?
A) All black, 1/2 curled
B) All black, all curled
C) 1/4 black and curled; 1/2 black and normal; 1/4 gray and normal
D) 3/4 black and curled; 1/4 black and normal
E) 9/16 black and curled; 3/16 black and normal, 3/16 gray and curled; 1/16 gray and normal -
Answer✔A) All black, 1/2 curled
George has a white hamster named Snow. When George mates Snow to a black hamster, he
obtains 12 black hamsters and 11 white. When two of Snow's black offspring are interbred, they
produce 15 black offspring. Which statement describes hamster fur color?
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Genetics PCB 3063 Practice Exams
Questions And Answers (Guaranteed A+)
Draw all of its chromosomes condensed at the end of mitotic prophase in the circle to the right: -
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: - 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: - 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. - 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 - Answer✔B) centromere
______________ the M phase (mitosis).
1|Page
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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 - 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. - 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 - 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. - 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.
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D) diploid cells with 64 chromosomes.
E) identical cells with 128 chromosomes. - 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 - 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 - 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 - 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 - Answer✔B) 1 GG : 2 Gg : 1 gg
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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. - 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 - 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, all 14 of the kittens
have black fur and 7 have curled ears. When the same female mates with a stray black cat with
normal ears, what would you expect to see in this second litter of kittens?
A) All black, 1/2 curled
B) All black, all curled
C) 1/4 black and curled; 1/2 black and normal; 1/4 gray and normal
D) 3/4 black and curled; 1/4 black and normal
E) 9/16 black and curled; 3/16 black and normal, 3/16 gray and curled; 1/16 gray and normal -
Answer✔A) All black, 1/2 curled
George has a white hamster named Snow. When George mates Snow to a black hamster, he
obtains 12 black hamsters and 11 white. When two of Snow's black offspring are interbred, they
produce 15 black offspring. Which statement describes hamster fur color?
4|Page
