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The Austrian monk who performed experiments with pea plants and
created laws governing genetics.
a. Mendel
c. Watson
b. Supernavage
d. Carson
In rats, black coat color is dominant over white coat color. If some of
the offspring of a cross between a black rat and white rat have white fur,
then you can determine that
a. the black rat was heterozygous
b. the white rat was heterozygous
c. the black rat was homozygous
d. you cannot be sure of either parents’ genotypes.
A white mouse (WW) is mated with a brown mouse (ww). What is the
probability that their offspring will be white?
a. 25%
c. 75%
b. 50%
d. 100%
Poor Mrs. Supernavage cannot roll her tongue. Only people with the
dominant allele for tongue rolling can actually roll their tongue. What
is Mrs. Supernavage’s genotype?
a. rr
c. RR or Rr
b. rr or RR
d. rr, RR or Rr
Which is true about people with the genotype I AIB for blood type?
a. They have two alleles that are codominant.
b. They exhibit a type O phenotype.
c. They are homozygous for blood type A.
d. They can only have type O children.
A karyotype of a human female shows that she has only one sex
chromosome (Turner’s Syndrome). Which genotype would represent
her condition?
a. XXX
c. X0
b. XYY
d. Trisomy 21
If an organism has 2 identical alleles, then that organism is
a. homozygous
c. unizygous
b. heterozygous
d. hybrid
Which cross could NOT produce a child with type AB blood?
a. IAi X IBIB
c. IAIB X ii
A A
B
b. I I X I i
d. IAi X IBi
Mr. Jones has blood type A and Mrs. Jones has blood type AB. What is
the probability that they will have a child with blood type A if Mr. Jones
is homozygous?
a. 0%
b. 25%
c. 50%
d. 100%
If a man has type AB blood and his wife has type O blood, what blood
types could their children have?
a. Type A only
c. Type A and B
b. Types A and O
d. Type A, B and O
In sickle cell anemia, the heterozygous condition results in resistance to
malaria. If two heterozygous parents have a child, what are the chances
of that child being resistant to malaria?
a. 25% b. 50%
c. 75% d. 100%
A test cross is done to determine whether a dominant parent is purebred
or heterozygous. What genotype would the dominant parent be crossed
with?
a. Homozygous dominant c. Homozygous recessive
b. Heterozygous dominant d. Heterozygous recessive
A genetic pedigree showing that mostly males are affected by a certain
disorder is evidence of what type of inheritance?
a. Dominant c. Recessive
b. Sex-linked d. Passive
In a genetics laboratory, two heterozygous tall plants are crossed. If tall
is dominant over short, what are the expected phenotypic results?
a. 100% tall
b. 75% tall, 25% short
c. 50% tall, 50% short
d. 25% tall, 50% short
A human skin cell contains 46 chromosomes. How many chromosomes
are present in a human sperm cell?
a. 23
b. 92
c. 46
d. 138
16. Height is a trait that is inherited as many possible
phenotypes as shown in the graph below. Which
of the following best explains the inheritance
pattern shown?
a. Sex-linkage
b. Polygenic inheritance
c. Codominance
d. Recessive gene
17. In cats, a pair of X-chromosomes will produce a
female, while XY produces a male. Fur color is
controlled by a single pair of alleles. The alleles
for orange fur and for black fur are located on the
X chromosome only. Cats that are black and
orange (tortoise-shell) have both alleles. Which
statement is true based on the information
provided?
a. Only the female cats will be tortoiseshell
b. Only the male cats can be tortoise-shell
c. Males inherit 2 alleles for fur color
d. Black and orange fur is not sex-linked.
18. Which represents a heterozygous genotype?
a. Bb
c. bb
b. BB
d. B’B’
19. Color blindness is a sex-linked recessive trait. If
a normal man XRY and a woman that is a carrier
(XRXr) have a child, which statement is correct?
a. All of the daughters will be colorblind.
b. All of the sons will have color vision.
c. There is a 25% chance that they will
have a colorblind son.
d. All of the sons will be colorblind.
20. What type of RNA is responsible for bringing
amino acids to the ribosome for protein synthesis?
a. Messenger RNA c. Ribosomal RNA
b. Transfer RNA
d. Mitochondrial RNA
21. Which of the following is an example of a
transgenic organism?
a. Humans with a cold
b. Bacteria with the human insulin gene
inserted
c. A mule
d. A purebred dog
22. A cross of GG X gg would result in which
genotypic ratio?
a. 1:2:1
b. 0:2:2 c. 0:4:0 d. 2:0:2 e. 4:0:0
23. In humans, normal color vision (R) is dominant
over color blindness (r). A man and a woman
with normal color vision produced two colorblind
sons and two daughters with normal vision.
Choose the correct parental genotypes.
a. XNY and XNXN
c. XnY and XNXN
N
N n
b. X Y and X X
d. XnY and XnXn
24. In the diagram of two homologous chromosomes,
what do R and r represent?
a. Two different alleles
b. Two gametes that can form a zygote
c. Two identical alleles
d. Two chromosomes in a hybrid pea plant
25. Which of the following is the mRNA strand coded for by the following
DNA strand: AGGTCCATTGGA
a. TCCAGGTAACCT
b. AGGTCCATTGGA
c. CUUGAACGGUUC
d. UCCAGGUAACCU
26. Which of the following is NOT currently possible using genetic
technology?
a. Curing Down Syndrome
b. Engineering a virus to treat Cystic Fibrosis
c. Creating a glow-in-the-dark rabbit
d. Creating a bacteria that manufacture human insulin
27. Some flowers show incomplete dominance. If RR = white and R’R’ =
red, which phenotypic ratio would be expected in the offspring of two
pink flowers?
a. 1 red: 2 pink: 1 white
c. 3 red: 0 pink: 1 white
b. 0 red: 4 pink: 0 white
d. 4 red: 0 pink: 0 white
28. Sexual reproduction provides for what to occur?
a. Cloning
c. Genetic Stability
b. Budding
d. Genetic Variation
29. Which term best describes the type of cell division in which parent cells
produce daughter cells with the same number of chromosomes as the
parent cells?
a. Mitosis
c. Spermatogenesis
b. Meiosis
d. Oogenesis
29. Before a cell goes through either mitosis or meiosis, which process
must be carried out by the DNA in the nucleus?
a. Replication
c. Transcription
b. Nondisjunction d. Translation
30. Gel Electrophoresis results are shown below from a crime scene.
Which suspect is linked to the crime scene?
a. A b. B c. C d. D
31. What is the primary cause of variation in the offspring of sexually
reproducing organisms?
a. Cytoplasmic division
b. Environmental changes
c. Mutation
d. Recombination of alleles
32. When viewing a karyotype to detect genetic disorders, which of the
following would be a concern?
a. Different pairs of chromosomes of different lengths
b. Two X chromosomes
c. Twenty-three pairs of chromosomes
d. Three chromosomes in any one set
e. One X and one Y chromosome
33. In order to form recombinant DNA, scientists have found a way to cut
a DNA segment using a restriction enzyme called EcoRi. This enzyme
cuts DNA wherever the sequence C-T-T-A-A-G occurs between the A
and the G bases. Which of these would result if EcoRi were used on
the DNA in this diagram?
34. Most sex-linked, recessive traits (including
hemophilia and color blindness) appear in
males. This phenomenon is best explained by
which statement?
a. Males have an X chromosome with
dominant genes.
b. Most of the genes on the X and Y
chromosomes of males are recessive.
c. In males, the recessive sex-linked genes
appear only on the Y chromosome.
d. In males, the Y chromosome lacks the
genes needed to mask the recessive genes
on the X chromosome.
35. Which two organisms are most closely related
according to the gel electrophoresis results
below?
a. I and II
c. II and III
b. I and IV
d. II and IV
36. Which process is shown below?
a. DNA replication
c. Translation
b. Transcription
d. Meiosis
37. There are three alleles for the ABO blood group
in humans. Why are there only two alleles
normally present in any individual?
a. The ABO alleles always segregate
independently during meiosis.
b. Each parent contributes only one ABO
allele to the offspring.
c. Every gene is recessive.
d. The alleles that determine blood type are
on the X-chromosome.
38. Which conclusion can be drawn from the
genetic information below?
a.
b.
c.
d.
The white parent carried a dominant allele.
All the F1 rabbits carried a recessive allele.
All the white rabbits are heterozygous.
All the F2 black rabbits are homozygous.
ALSO STUDY:
- Pedigrees
- Protein
Synthesis
- Mitosis vs. Meiosis
- Genetic Disorders