Genetics Exam 1 Complete Exam Study
Questions with Expert Graded A+ Answers
| Latest Edition
1. What is genetics? - ANSWER study of genes and what they do; branch of
biology that deals with heredity and variation
2. Sister Chromatids are held together by a protein called ____________ until
anaphase when ______________ removes it to allow them to separate. -
ANSWER cohesin, separase
3. A horse has two alleles for color: black and brown. Which option is a way to
determine which color is dominant? - ANSWER Take a homozygous black
horse and mate it with a homozygous brown horse and look at the
phenotypes of the progeny
4. What is the result of the G1/S checkpoint? - ANSWER the cell commits to
divide
5. In the karyotype of a haploid cell, each individual chromosome looks
different. - ANSWER True
6. In a species where 2n = 8, a haploid cell may contain: - ANSWER either 4
or 8 DNA molecules
7. In a species where n = 18, one cell contains 36 chromosomes and 36 DNA
molecules. What stage is this cell in? - ANSWER G1 Stage
,8. What is the diploid number for the species if the cell shown is in metaphase I
of meiosis? (cell shown shows 6 centromeres) - ANSWER 6
9. Which of these pairs are not independent of each other? - ANSWER The
probability that it will rain and the probability that you will (most likely) get
wet if you are standing outside with no umbrella in a rainstorm.
10.Suppose in flies, red eyes are dominant over brown eyes. If for this trait, a
homozygous recessive fly is mated with a heterozygous fly, what is the
probability that the fly will have brown eyes? - ANSWER 50 %
11.Which Law would you use to answer the following question: What is the
chance of flipping a coin and getting three heads in a row? (NOTE: H1 =
heads on the first roll, H2 = heads on the second roll, etc.) - ANSWER
Multiply (P(3 heads in a row) = P(H1) x P(H2) x P(H3))
12.If in humans, brown eyes are dominant over green eyes, and two
heterozygous parents have three children, what is the probability that all of
the kids will have green eyes? - ANSWER 1.6 %
13.If the probability that a bird will lay an egg is 75%, the probability that the
egg will hatch is 50%, and the probability that the chick will be eaten by a
snake before it fledges is 20%, what is the probability that a parent will have
progeny that survive to adulthood? - ANSWER 30%
14.Which of the following best describes the concept of independent
assortment? - ANSWER Gametes receive one of each chromosome pair but
which chromosome it receives is decided randomly
15.It has been found that at a certain locus of the human genome, 200 different
alleles exist in the population. Each person has at most _______ alleles. -
ANSWER 2
,16.The location of each crossing over on a chromosome is random. -
ANSWER True
17.The table below shows the progeny of a test cross of a heterozygote
(MmRrDd). Each row shows the number of progeny that inherited each
combination of alleles from the heterozygous parent. Which combinations of
alleles represent a double crossover? Choose all that apply.
m R d: 8
M r d: 110
m r d: 38
m r D: 29
M R D: 42
M R d: 31
m R D: 107
M r D: 6 - ANSWER M r D, m R d
18.In the world of Weeping angels, those with pointy wings are (A_), while
those with round wings are (aa).
In the efforts to explore this extraordinary species, you wish to determine the
genotype of a pointy winged angel. Luckily, you have trapped a round winged
angel that you can cross the pointy winged angel with.
If the pointy winged angel is heterozygous what phenotypic ratio do you expect
from their offspring? (Pointy wing: round wing) - ANSWER 1:1
, 19.In hamsters, black hair (B) is dominant over gray (b) hair color. A black
hamster is bred to a grey hamster, resulting in 8 black and 7 grey hamsters in
F1.
What are the genotypes of the parents?
Parent with black hair:________ Parent with gray hair:________ -
ANSWER Bb, bb
20.In Vulcans, black hair and pointy ears are dominant traits. Pollar has black
hair but rounded ears. Damak, his mate, has red hair and pointed ears. Their
first child, T'Pal, has red hair and rounded ears. Their second child, Spock,
has black hair and pointed ears. Use EE or Ee for pointed ears and BB or Bb
for black hair and answer the following:
What is Pollar's genotype? - ANSWER Bbee
21.You are following segregation of four genes in a cross - A, B, C, and D.
Dominant alleles are capital letters and recessive alleles are small case.
You take the cross - aa Bb cc Dd x Aa Bb CC Dd. What is the frequency
expected among the progeny for the heterozygous genotype: Aa Bb Cc Dd? -
ANSWER 1/8
22.A man has six fingers on each hand and six toes on each foot. His wife and
their daughter have a normal number of digits. Having extra digits is a
dominant trait. The couple's second child has extra digits. What is the
probability that their next (third) child will have extra digits? - ANSWER
1/2
23.You've isolated neon green cockroaches under the kitchen sink and have
been examining them. You wish to determine if this color is transmitted in
simple Mendelian fashion. You cross the neon green with your basic brown
cockroach and end up with all neon green cockroaches. You allow the F1 to
self and observe the following:
Questions with Expert Graded A+ Answers
| Latest Edition
1. What is genetics? - ANSWER study of genes and what they do; branch of
biology that deals with heredity and variation
2. Sister Chromatids are held together by a protein called ____________ until
anaphase when ______________ removes it to allow them to separate. -
ANSWER cohesin, separase
3. A horse has two alleles for color: black and brown. Which option is a way to
determine which color is dominant? - ANSWER Take a homozygous black
horse and mate it with a homozygous brown horse and look at the
phenotypes of the progeny
4. What is the result of the G1/S checkpoint? - ANSWER the cell commits to
divide
5. In the karyotype of a haploid cell, each individual chromosome looks
different. - ANSWER True
6. In a species where 2n = 8, a haploid cell may contain: - ANSWER either 4
or 8 DNA molecules
7. In a species where n = 18, one cell contains 36 chromosomes and 36 DNA
molecules. What stage is this cell in? - ANSWER G1 Stage
,8. What is the diploid number for the species if the cell shown is in metaphase I
of meiosis? (cell shown shows 6 centromeres) - ANSWER 6
9. Which of these pairs are not independent of each other? - ANSWER The
probability that it will rain and the probability that you will (most likely) get
wet if you are standing outside with no umbrella in a rainstorm.
10.Suppose in flies, red eyes are dominant over brown eyes. If for this trait, a
homozygous recessive fly is mated with a heterozygous fly, what is the
probability that the fly will have brown eyes? - ANSWER 50 %
11.Which Law would you use to answer the following question: What is the
chance of flipping a coin and getting three heads in a row? (NOTE: H1 =
heads on the first roll, H2 = heads on the second roll, etc.) - ANSWER
Multiply (P(3 heads in a row) = P(H1) x P(H2) x P(H3))
12.If in humans, brown eyes are dominant over green eyes, and two
heterozygous parents have three children, what is the probability that all of
the kids will have green eyes? - ANSWER 1.6 %
13.If the probability that a bird will lay an egg is 75%, the probability that the
egg will hatch is 50%, and the probability that the chick will be eaten by a
snake before it fledges is 20%, what is the probability that a parent will have
progeny that survive to adulthood? - ANSWER 30%
14.Which of the following best describes the concept of independent
assortment? - ANSWER Gametes receive one of each chromosome pair but
which chromosome it receives is decided randomly
15.It has been found that at a certain locus of the human genome, 200 different
alleles exist in the population. Each person has at most _______ alleles. -
ANSWER 2
,16.The location of each crossing over on a chromosome is random. -
ANSWER True
17.The table below shows the progeny of a test cross of a heterozygote
(MmRrDd). Each row shows the number of progeny that inherited each
combination of alleles from the heterozygous parent. Which combinations of
alleles represent a double crossover? Choose all that apply.
m R d: 8
M r d: 110
m r d: 38
m r D: 29
M R D: 42
M R d: 31
m R D: 107
M r D: 6 - ANSWER M r D, m R d
18.In the world of Weeping angels, those with pointy wings are (A_), while
those with round wings are (aa).
In the efforts to explore this extraordinary species, you wish to determine the
genotype of a pointy winged angel. Luckily, you have trapped a round winged
angel that you can cross the pointy winged angel with.
If the pointy winged angel is heterozygous what phenotypic ratio do you expect
from their offspring? (Pointy wing: round wing) - ANSWER 1:1
, 19.In hamsters, black hair (B) is dominant over gray (b) hair color. A black
hamster is bred to a grey hamster, resulting in 8 black and 7 grey hamsters in
F1.
What are the genotypes of the parents?
Parent with black hair:________ Parent with gray hair:________ -
ANSWER Bb, bb
20.In Vulcans, black hair and pointy ears are dominant traits. Pollar has black
hair but rounded ears. Damak, his mate, has red hair and pointed ears. Their
first child, T'Pal, has red hair and rounded ears. Their second child, Spock,
has black hair and pointed ears. Use EE or Ee for pointed ears and BB or Bb
for black hair and answer the following:
What is Pollar's genotype? - ANSWER Bbee
21.You are following segregation of four genes in a cross - A, B, C, and D.
Dominant alleles are capital letters and recessive alleles are small case.
You take the cross - aa Bb cc Dd x Aa Bb CC Dd. What is the frequency
expected among the progeny for the heterozygous genotype: Aa Bb Cc Dd? -
ANSWER 1/8
22.A man has six fingers on each hand and six toes on each foot. His wife and
their daughter have a normal number of digits. Having extra digits is a
dominant trait. The couple's second child has extra digits. What is the
probability that their next (third) child will have extra digits? - ANSWER
1/2
23.You've isolated neon green cockroaches under the kitchen sink and have
been examining them. You wish to determine if this color is transmitted in
simple Mendelian fashion. You cross the neon green with your basic brown
cockroach and end up with all neon green cockroaches. You allow the F1 to
self and observe the following:
