Biology 1 - The Life Sciences » 2019 » Module 5 Exam
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Question #1
Homologous chromosomes are matched in
A.
length
B.
gene locations
C.
centromere position
D.
none of the above, they are not matched!
E.
all of the above
Question #2
If a eukaryotic cell has 30 chromosomes and it undergoes meiosis, how many cells will result, and how many chromosomes will they contain?
A.
4 cells, each with 30 chromosomes
B.
2 cells, each with 15 chromosomes
C.
4 cells, each with 15 chromosomes
D.
2 cells, each with 10 chromosomes
Question #3
Haploid means having
A.
one complete set of chromosomes.
B.
three complete sets of chromosomes.
C.
two chromosomes in each gamete.
D.
two complete sets of chromosomes.
E.
two chromosomes in each somatic cell.
Question #4
A portion of DNA that encodes a specific protein is
A.
a chromosome
B.
a centromere
C.
a chromatid
D.
a gene
Question #5
The mother determines the sex of the child
A.
TRUE
B.
FALSE
Question #6
If a woman in her late forties wants to have a baby and seeks medical advice, she will likely be advised that she is at greater risk of having a baby with Down syndrome.
A.
FALSE
B.
TRUE
Question #7
Alleles are described as
A.
homologous chromosomes
B.
environmental factors that affect gene expression
C.
alternate versions of phenotypes
D.
alternate versions of a gene
Question #8
Of all the people who have studied inheritance, the person who made the most lasting impression on the science of genetics, often called the "father of genetics" is
A.
King George III.
B.
Charles Darwin.
C.
Robert Hooke.
D.
Gregor Mendel.
Question #9
If a healthy young couple are both carriers of albinism (a recessive disorder), the chance that each of their future children will inherit this condition is
A.
50%
B.
100%
C.
25%
D.
10%
Question #10
Mendel discovered the phenomenon known as dominance when he
A.
Mendel never observed dominance in his studies
B.
crossed pollinated his pure strains
C.
first planted his pure strains
D.
cross pollinated the offspring
Question #11
When Gregor Mendel conducted his experiments, the first step was to ______________.
A.
determine which trait was dominant
B.
find out what chromosome the character was found on
C.
Grow pure strains of his plants
D.
Perform a test cross
Question #12
A true-breeding plant that produces yellow seeds is crossed with a true-breeding plant that produces green seeds. The seeds of all of the offspring are yellow. Why?
A.
The alleles are codominant.
B.
All of the offspring are homozygous yellow.
C.
The yellow allele is dominant to the green allele.
D.
The yellow allele is recessive to the green allele
Question #13
Crossing red flowering snapdragons with white flowering snapdragons yields seeds that grow into snapdragons with pink flowers. This suggests that
A.
pink flowers are dominant
B.
incomplete dominance is occurring
C.
white flowers are dominant
D.
red flowers are dominant
E.
codominance is occurring
Question #14
In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
A.
dd
B.
Dd
C.
DD
D.
DI
Question #15
Which of these crosses will only produce heterozygous offspring?
A.
AA x Aa
B.
aa x aa
C.
Aa x Aa
D.
AA x aa
Question #16
The most common allele for any trait is always the dominant allele.
A.
TRUE
B.
FALSE
Question #17
The environment only rarely affects gene expression.
A.
FALSE
B.
TRUE
Question #18
The wide variation in skin color in humans is best explained by
A.
Skin color is influenced by environmental changes like improvements in diet.
B.
Skin color is influenced by an X-linked gene.
C.
Skin color is a polygenic trait.
D.
Skin color is influenced by crossing over.
Question #19
An organism that receives recombinant DNA
A.
is a new species.
B.
will develop cancer.
C.
is a transgenic organism.
D.
has a genetic disease.
Question #20
Suppose that Taylor starts with one double-stranded piece of DNA in a reaction tube. After four rounds of PCR, how many pieces of double-stranded DNA will be in Taylor’s reaction tube?
A.
64
B.
10
C.
32
D.
16
Question #21
How can stem cells replace faulty cells in the body?
A.
Faulty cells can be coaxed to differentiate into stem cells and directly replace the faulty cells and their functions.
B.
Stem cells can be coaxed to differentiate into the needed specific cell type.
C.
Stem cells can meiotically divide, providing more stem cells to directly replace the faulty cells and their functions.
D.
Stem cells can mitotically divide, providing more stem cells to directly replace the faulty cells and their functions.
Question #22
Cloning through DNA technology is most similar to
A.
sexual reproduction.
B.
meiosis.
C.
mate selection.
D.
asexual reproduction.
Question #23
DNA technology is used to
A.
copy DNA.
B.
turn genes on and off.
C.
All answers are correct.
D.
search for specific sequences of DNA.
E.
sequence DNA nucleotides.
Question #24
DNA technology can be used to determine how humans are related to other living organisms.
A.
FALSE
B.
TRUE
Question #25
Electrophoresis is used in DNA sequencing
A.
to remove DNA from an organism.
B.
to make copies of the DNA fragments.
C.
to transfer DNA between organisms.
D.
to separate the DNA fragments.
Question #26
Genetic testing may lead to ethical issues, such as whether results should be used to determine who receives health insurance.
A.
FALSE
B.
TRUE
Question #27
A male expresses an X-linked recessive disorder if he inherits these alleles from his father.
A.
FALSE
B.
TRUE
Question #28
Humans possess _______ pairs of chromosomes.
A.
92
B.
46
C.
12
D.
23
E.
2
Question #29
Which phase of meiosis involves the alignment of the tetrads to the center of the cell?
A.
Metaphase I
B.
Anaphase I
C.
Prophase I
D.
Metaphase II
Question #30
A 'karyotype' is
A.
The collection of chromosomes from a single individual
B.
The first step in mitosis
C.
a mutation on a chromosome
D.
None of the above
Question #31
Which event in meiosis involves the separation of sister chromatids?
A.
Anaphase I
B.
Metaphase I
C.
Telophase I
D.
Anaphase II
Question #32
Meiosis is a process that produces ,,
A.
egg cells
B.
sperm cells
C.
gametes
D.
haploid cells
E.
all of the above
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