Download Unit 3 Exam Review

Classical Genetics Self-Quiz I
QUESTION 1
1. For each gene, an individual has
a. one allele
b. two
alleles, not necessarily the same
c. two
alleles that are the same
d. 2
or more alleles
1 points
QUESTION 2
1. A cross between a heterozygote and a homozygous recessive produces offspring
a. all
with dominant phenotype
b. all
with recessive phenotype
c. with
both dominant and recessive phenotype in a 3:1 ratio
d. with
both dominant and recessive phenotype in a 1:1 ratio
1 points
QUESTION 3
1. Brown eyes is a dominant trait, blue eyes is recessive. In a cross between 2 brown-eyed
heterozygotes, what proportion of the offspring would we expect to have brown eyes?
a. 100%
b. 75%
c. 50%
d. 25%
e. 0%
1 points
QUESTION 4
1. Two brown-eyed parents have 4 children, all with brown eyes. What are NOT possible
genotypes of the 2 parents?
a. BB
and BB
b. Bb
and Bb
c. BB
and Bb
d. BB
and bb
e. both
choices b and d
1 points
QUESTION 5
1. A man with brown eyes who is a heterozygote marries a woman with brown eyes who is
homozygous. What can we say about the possible eye color of their children?
a. They will
b. Half
all have brown eyes.
will have brown eyes.
c. 75% will
have brown eyes.
d. We can't
say for sure.
1 points
QUESTION 6
1. In snapdragons there is incomplete dominance. One homozygote is red and the other is white.
Heterozygotes are pink. What color offspring are expected from a cross between 2 pink plants?
a. red
b. red
and white
c. pink
d. red,
white and pink
1 points
QUESTION 7
1. If an individual with Type A blood, whose mother has Type O, marries an individual with Type
AB blood what are all the possible offspring blood types?
a. A
b. A,
B
c. A,
B, AB
d. A,
B, O
e. A,
AB
1 points
QUESTION 8
1. A Siamese cat has a mostly white fur but black ears and paws because
a. the
alleles for black fur are only in the feet.
b. if
tissues are cold the alleles express black fur color
c. if
tissues are hot the alleles express white fur color
d. its
feet are homozygous for black but its body is homozygous for white
Classical Genetics Self-Quiz II
QUESTION 1
1. The ability to roll the tongue is caused by an autosomal dominant allele (R, it is not sex-linked).
Bob and his wife Alice can roll their tongues, but 2 of their children cannot. What are the
genotypes of Bob and Alice?
a. Rr
and Rr
b. RR
c. Rr
and Rr
and rr
d. rr and
e. RR
rr
and RR
1 points
QUESTION 2
1. If a boy has a sex-linked trait, such as hemophilia, he inherited it from his
a. mother
b. father
c. both
parents
d. either
parent
1 points
QUESTION 3
1. Two carriers of an autosomal recessive genetic disease marry. What are the chances that their
children will have the disease?
a. 0
b. 1/4
c. 1/2
d. 3/4
e. all
will have it
1 points
QUESTION 4
1. For an autosomal dominant genetic disease, such as Huntington's, if a normal man marries an
affected woman, what proportion of their children would be expected to have the disease?
a. all
b. 3/4
c. 1/2
d. 1/4
e. none
1 points
QUESTION 5
1. A woman who is a carrier for hemophilia (sex-linked trait) marries a man with hemophilia. What
is the probability of hemophilia in their children?
a. all
of the boys and none of the girls will have hemophilia
b. all
of their children will have hemophilia
c. half
d. the
of both boys and girls will have hemophilia
girls will all be carriers and the half the boys will have the disease
1 points
QUESTION 6
1. A woman with type O blood has a baby with type A. She claims her boyfriend is the father; he
has type B. Can he be the father?
a. yes
b. no
1 points
QUESTION 7
1. Which is an example of a multifactorial trait?
a. tongue rolling
b. earlobe
attachment
c. hemophilia
d. height
1 points
QUESTION 8
1. A woman who is homozygous for normal vision is married to a colorblind man (sex-linked
recessive trait). What is the probability of colorblindness in their children?
a. 0
b. 0
c. ½
in girls, ½ in boys
d. 0
in both girls and boys
in girls, 1 in boys
Molecular Genetics Self-Quiz
QUESTION 1
1. The structure of DNA has been described as a twisted ladder. The rungs of this ladder consist of
a. phosphates
b. pairs
of deoxyribose molecules
c. pairs
of bases
d. individual
deoxyribose molecules
e. individual
base molecules
1 points
QUESTION 2
1. If one side of a portion of a DNA molecule has the base sequence ACCTG, what is the sequence
in the opposite strand?
a. ACCTG
b. GTCCA
c. GTTCA
d. TGGAC
1 points
QUESTION 3
1. How many amino acids would be coded for by the following DNA base sequence?
AAGTCCTGGAAT
a. 12
b. 6
c. 4
d. 3
e. 2
1 points
QUESTION 4
1. What is the approximate number of different amino acids that are coded for by DNA?
a. 5
b. 10
c. 15
d. 20
e. 30
1 points
QUESTION 5
1. Which of the following is the molecule that ferries amino acids to the site of protein synthesis?
a. mRNA
b. tRNA
c. ribosomes
d. DNA
e. codons
1 points
QUESTION 6
1. During replication, DNA is "unzipped by
a. ATP
b. an
enzyme
c. mRNA
d. tRNA
e. ribosomes
1 points
QUESTION 7
1. A mutation in which of the following can be passed on to offspring
a. a somatic cell
b. a germ
cell
1 points
QUESTION 8
1. In DNA replication, which statement about the 2 resulting copies is correct?
a. Each
copy is a random mixture of nucleotides from the original 2 stranded molecule.
b. One copy is
the original molecule, the other is brand new.
c. Each
copy is made of completely new nucleotides.
d. Each
copy has one original strand of nucleotides opposite one new one.
1 points
QUESTION 9
1. Foreign genes can be inserted into bacteria using
a. plasmids
b. triplets
c. stop
codons
d. start
and stop codons
1 points
QUESTION 10
1. Small amounts of DNA can be amplified very rapidly using
a. electrophoresis
b. plasmids
c. PCR
d. Bt
1 points
QUESTION 11
1. How many codons are there?
a. 3
b. 4
c. 20
d. 64