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Biology 115 - Exam 3.
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Biology 115 - Exam 3A person with type A blood had parents with the following blood types: one parent had AB
blood, and the other parent had type O. This person with type A blood has a child with a
person that has type O blood. Which of the following is INCORRECT for the probability of
them having a child with each of the following blood types? - correct answer-A - 25%
In DNA replication, the enzyme helicase breaks [x] bonds, while the enzyme ligase makes
[y] bonds - correct answer-In DNA replication, the enzyme helicase breaks hydrogen bonds,
while the enzyme ligase makes phosphodiester bonds
In Mendelates, height is a quantitative trait encoded by genes D and E. These genes are
also linked. The homologous pair of chromosomes for a heterozygous individual for both
genes is shown below. If crossing over did NOT occur, which of the following gametes could
this individual produce? - correct answer-A and B
Which of the following is a possible genotype of an offspring of two Mendelates that are both
heterozygous for genes D and E? - correct answer-Ddee
Jumping spiders have 36 pairs (2n = 72) of chromosomes in their somatic cells. How many
molecules of DNA would you find in the nucleus of each cell of a jumping spider's muscle
immediately after completing mitosis? - correct answer-72
Jumping spiders have 36 pairs (2n = 72) of chromosomes in their somatic cells. Spider eggs,
which are produced by _______________, contain _______________ chromosomes. -
correct answer-Meiosis; 36
Jumping spiders have 36 pairs (2n = 72) of chromosomes in their somatic cells. Which of the
following correctly describes how you would expect the chromosomes to be aligned at
Meiosis I? Lined up..... - correct answer-in homologous pairs; 36 replicated pairs of
chromosomes with the position of the maternal chromosome randomly determined
Below is shown a close-up of the portion of a DNA replication bubble found in the highlighted
box. Helicase is shown as a green triangle currently moving from left to right. Based upon
what you know about the creation of new DNA during replication, which is the lagging strand
and why? - correct answer-It is impossible to tell with the information provided.
Coat color in horses is inherited via incomplete dominance. Horses are either black (BB),
white (bb), or grey (Bb). Grey foals are in high demand and can earn a breeder more cash.
Which combination of parents will produce the highest number of grey foals? - correct
answer-All result in the same probability of grey horses.
An individual has the genotype of RRYy for two Mendelian genes. Select all of the following
that are possible gametes from this individual: - correct answer-RY,Ry
, Match each of the following proteins involved in DNA replication to their function. - correct
answer-Helicase
F.
Breaks H-bonds to open the replication bubble.
Topoisomerase
D.
Breaks a single covalent bond ahead of the replication bubble to relieve twisting tension.
Single-Stranded DNA Binding Proteins
C.
Prevents the re-annealing of single-stranded DNA.
DNA Polymerase III
B.
Recognizes double-stranded DNA/RNA hybrid and synthesizes DNA from that point in a 5' to
3' manner.
DNA Polymerase I
A.
Removes the RNA primer and lays down DNA nucleotides in its place.
Primase
E.
Lays down short tracks of RNA nucleotides that complementary base-pair with DNA
nucleotides.
DNA ligase
G.
Creates a single covalent bond between lagging-strand fragments.
Hemophilia is a hereditary genetic disorder that impairs the body's ability to control blood
clotting or coagulation. This trait is associated with the X chromosome and is recessive in
nature. If a heterozygous egg parent and a sperm parent with hemophilia have children,
what is the probability of their XX offspring having the disorder? - correct answer-50%
In pea plants, two Mendelian genes control flower color and plant height. For flower color,
purple is dominant to white. For plant height, tall is dominant to short. You are interested in
determining the genotype of a random purple, tall plant from your stock. To do so, you
should perform a test cross with a plant with which of the following genotypes? - correct
answer-White and short
Imagine that fur thickness in dogs is inherited due to a single gene with two possible alleles.
As long as a single dominant copy of the gene is present, the fur is very thick. The only way
thin fur is passed is if two copies of the recessive allele is present. What inheritance pattern
best describes the above scenario? - correct answer-Mendelian
Now imagine that fur thickness in dogs is inherited via three different genes (each with two
possible alleles). The addition of dominant alleles makes the fur more thick. The addition of
recessive alleles makes the fur thinner. The majority of dogs have a median fur thickness.
What inheritance pattern best describes the above scenario? - correct answer-Quantitative
Trait
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