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Chapter 7 Test Review
January 31, 2011
Biology I
A person who has a disorder caused by a
recessive allele is
a. considered a carrier of the
disorder. b. homozygous for the
recessive allele. c. unable to pass
the allele to offspring. d. certain to
have offspring with the disorder.
Present your answers!
B
Two parents have the genotype Gg for a
genetic disorder caused by a dominant
allele. What is the chance that any of
their children will inherit the disorder?
a. 25% b. 50% c. 75% d. 100%
Present your answers!
C
Human height occurs in a continuous
range because it is affected by the
interaction of several genes, making it
a
a. autosomal trait. b. sex-linked trait.
c. polygenic trait. d. codominant trait.
Present your answers!
C
The gene linkage map shown in Figure 7.2 shows the
order of genes A, B, and C. Which of the
following statements about the genes is true?
a. The distance between A and B is 6 map units. b. A
and B cross over 14.5% of the time. c. A and C
are linked 8.5% of the time. d. B and C are most
likely to be inherited together.
Present your answers!
B
A female is born with attached earlobes,
which is a recessive phenotype. Which
of the following genotypes could her
parents have?
a. RR and RR b. Rr and RR c. Rr and
rr d. RR and rr
Present your answers!
C
Suppose a person is a carrier for a genetic
disorder. Which of the following phrases
about this person is true?
a. does not have the disorder but can pass it on
b. will develop the disorder only late in life
c. cannot pass the disorder to sons, just
daughters d. the allele is not passed on due
to Y chromosome inactivation
Present your answers!
A
Which of the following tools is used to
match up chromosomes by
homologous pairs?
a. pedigree chart b. karyotype
c. meiosis map d. linkage map
Present your answers!
B
Suppose a person is homozygous
recessive for a recessive genetic
disorder. This genotype means that the
person
a. is a carrier for the disorder. b. has the
genetic disorder. c. cannot pass on the
gene. d. is healthy and is not a carrier.
Present your answers!
B
Down syndrome is characterized by
having an extra copy of at least a
portion of chromosome 21. Which of
the following methods would quickly
identify the disorder?
a. pedigree chart b. karyotype
c. meiosis map d. linkage map
Present your answers!
B
Variation in human skin color is an
example of
a. incomplete dominance.
b. codominance. c. polygenic traits.
d. multiple alleles.
Present your answers!
C
What is shown in Figure 11–3?
a. independent assortment b. anaphase I
of meiosis c. crossing-over
d. replication
Present your answers!
C
Linked genes
a. are never separated. b. assort
independently. c. are on the same
chromosome. d. are always recessive.
Present your answers!
C
Linkage maps are based on
a. the frequencies (or percentages) of
crossing-over between genes.
b. independent assortment. c. genetic
diversity. d. the number of genes in a
cell.
Present your answers!
A
If two genes are on the same chromosome and
rarely assort independently (in other words,
rarely separated by crossing over),
a. crossing-over never occurs between the
genes. b. crossing-over always occurs
between the genes. c. the genes are
probably located far apart from each other.
d. the genes are probably located close to
each other.
Present your answers!
D
Hemophilia is X-linked recessive. Refer to Figure 111. If individual III-2 marries a person with the
same genotype as individual I-1, what is the
chance that one of their children will be afflicted
with hemophilia?
a. 0% b. 25% c. 50% d. 75%
Present your answers!
A
For the trait being followed in the
pedigree, individuals II-1 and II-4 in
Figure 11-1 can be classified as ____.
a. homozygous dominant b. mutants
c. homozygous recessive d. carriers
Present your answers!
D
What is the relationship between
individual I-1 and individual III-2 in
Figure 11-1?
a. grandfather-granddaughter
b. grandmother-grandson c. great
aunt-nephew d. mother-son
Present your answers!
B
If a female fruit fly heterozygous for red
eyes (XRXr) crossed with a whiteeyed male (XrY), what percent of their
offspring would have white eyes?
a. 0% b. 25% c. 50% d. 75%
Present your answers!
C
A cross between a white rooster and a black
hen results in 100% blue Andalusian
offspring. When two of these blue offspring
are mated, the probable phenotypic ratio
seen in their offspring would be ____.
a. 100% blue b. 75% black, 25% white
c. 75% blue, 25% white d. 25% black,
50% blue, 25% white
Present your answers!
D
Examine the graph in Figure 11-3, which
illustrates the frequency in types of skin
pigmentation in humans. Another human
trait that would show a similar inheritance
pattern and frequency of distribution is
____.
a. height b. blood type c. number of fingers
and toes d. incidence of cystic fibrosis
Present your answers!
A
A man heterozygous for blood type A
marries a woman heterozygous for
blood type B. The chance that their
first child will have type O blood is
____.
a. 0% b. 25% c. 50% d. 75%
Present your answers!
B
This pedigree shows the
transmission of a rare disease
that is debilitating but not lethal.
Carriers are not shown.
Which type of heredity does the
pedigree in Figure 11-6
demonstrate?
a. autosomal recessive
b. autosomal dominant c. Xlinked recessive d. X-linked
dominant
Present your answers!
C
The X and Y chromosomes are called the
a. extra chromosomes. b. phenotypes.
c. sex chromosomes. d. All of the
above
Present your answers!
C
female : XX ::
a. female : gametes b. female : eggs
c. male : YY d. male : XY
Present your answers!
D
A diagram in which several generations
of a family and the occurrence of
certain genetic characteristics are
shown is called a
a. Punnett square. b. monohybrid cross.
c. pedigree. d. family karyotype.
Present your answers!
C
Which of the following traits is
controlled by multiple alleles in
humans?
a. sickle cell anemia b. blood type
c. hemophilia d. pattern baldness
Present your answers!
B
What would be the blood type of a
person who inherited an A allele from
one parent and an O allele from the
other?
a. type A b. type B c. type AB d. type
O
Present your answers!
A
While studying several generations of a particular
family, a geneticist observed that a certain disease
was found equally in males and females and that
all children who had the disease had parents who
also had the disease. The gene coding for this
disease is probably
a. sex-linked recessive. b. sex-linked dominant.
c. autosomal recessive. d. autosomal dominant.
Present your answers!
D
If a characteristic is sex-linked, it
a. occurs most commonly in males.
b. occurs only in females. c. can
never occur in females. d. is always
fatal.
Present your answers!
A
If a characteristic is sex-linked, the gene
for it is found on
a. a sex chromosome. b. an autosome.
c. a linked chromosome. d. an allele.
Present your answers!
A
In humans, eye color and height are
controlled by
a. simple dominance. b. multiple alleles.
c. polygenic inheritance.
d. incomplete dominance.
Present your answers!
C
How many chromosomes are shown in a
normal human karyotype?
a. 2 b. 23 c. 44 d. 46
Present your answers!
D
Which of the following are shown in a
karyotype?
a. homologous chromosomes b. sex
chromosomes c. autosomes d. all of
the above
Present your answers!
D
Which of the following can be observed
in a karyotype?
a. a change in a DNA base b. an extra
chromosome c. genes d. alleles
Present your answers!
B
In a pedigree, a circle represents a(an)
a. male. b. female. c. child. d. adult.
Present your answers!
B
Which of the following genotypes result
in the same phenotype?
a. IAIA and IAIB b. IBIB and IBi
c. IBIB and IAIB d. IBi and ii
Present your answers!
B
The abnormality of the
karyotype shown in
Figure 11-7 is
___________________
_.
Present your answers!
3 #21’s (Down syndrome)
The karyotype in Figure 117 has a total of
____________________
chromosomes.
Present your answers!
47
This person to whom
the karyotype in
Figure 11-7 belongs
has a total of
_________________
___ autosomes.
Present your answers!
45
Inheritance in which two dominant
alleles are expressed at the same time
is called ____________________.
Present your answers!
codominance
A phenomenon in which a heterozygous
individual has a phenotype that is
intermediate between the phenotypes
of its two homozygous parents is
called ____________________.
Present your answers!
Incomplete dominance
Two couples, the Pages and the Bakers, had
baby boys in the same hospital at the same
time. There was a mixup in the hospital
nursery. Use the information given in Table
11-1. Which baby belongs to which family?
Present your answers!
Baby 1- Page
Baby 2 – Baker
Use the following information to create a linkage map:
C and B are separated by crossing over 15% of the time
C and A are separated by crossing over 7% of the time
A and B are separated by crossing over 8% of the time
Present your answers!
B
A
C
Use the following information to create a linkage map:
A and C are separated by crossing over 22% of the time
C and B are separated by crossing over 2% of the time
C and D are separated by crossing over 4% of the time
A and B are separated by crossing over 24% of the time
B and D are separated by crossing over 2% of the time
A and D are separated by crossing over 26% of the time
Present your answers!
A
CBD
Pure-breeding red radishes crossed with purebreeding white radishes make purple radishes.
a. What is the inheritance pattern of this trait?
(incomplete dominance or codominance)
b. If you cross a purple radish with a white
radish, what percent of the offspring will be
purple?
Present your answers!
a. Incomplete dominance
b. 50%
When pure breeding red cows are bred with
pure breeding white cows, the offspring are
roan (have red and white hairs).
a. What is the inheritance pattern of this trait?
(incomplete dominance or codominance)
b. If you cross two roan cows, what percent of
the offspring will be white?
Present your answers!
a. Codominance
b.25%
Ben has type AB blood and Claire has
type B blood. Claire’s mother has type O
blood. What is the likelihood that Ben and
Claire’s child will have type B blood?
Present your answers!
50%
The father of a child has type AB blood. The
mother has type A. Which blood type(s) can
their children NOT have?
Present your answers!
Type O
The mother has type A blood. Her husband
has type B blood. Their child has type O
blood. the father claims the child can’t be his.
Is he right? Support your answer with a
Punnett Square.
Present your answers!
No, the child can be his
The mother has type B blood. Her husband has
type AB blood. Their child has type O blood.
the father claims the child can’t be his. Is he
right? Support your answer with a Punnett
Square.
Present your answers!
Yes, he is right, the child
cannot be his
The gene for hemophilia is located on the X
chromosome. It is a recessive disorder. Cross a
healthy man with a woman who is a carrier.
What percentage of the male children will
have hemophilia?
Present your answers!
50%
What is the probability that a couple
whose blood types are AB and O will
have a type A child?
Present your answers!
50% A
Cats can have no tails (NN), long tails (LL), or
short tails (NL).
a. What type of inhertance pattern is this?
b. Cross a short tail cat and a cat with not tail.
What are the possible phenotypes of their
offspring?
Present your answers!
a. Incomplete dominance
b.Short tails and no tails
In chickens, the gene for feather color has two alleles
- one for black feathers (BB) and one for white
feathers (WW). Heterozygous chickens (BW) have
BOTH black and white feathers, resulting in a
distinctive speckled feather.
a. What type of inheritance pattern is this?
b. Cross a black chicken and speckled chicken. What
are the possible phenotypes of the offspring?
Present your answers!
a. Codominance
b.Black and speckled
Philanderdats live on Mars. Skin color is blue (BB)
or red (RR) if homozygous. The heterozygous (BR)
has red and blue spotted skin.
a. What type of inheritance pattern is this?
b. If you cross a blue philanderdat and a spotted
philanderdat, can any of their children be spotted?
Show the Punnett Square to prove your answer.
Present your answers!
a. Codominance
b.yes
In a cross between a white-eyed female
fruit fly and a red-eyed male, what
percent of the FEMALE offpsring will
have white eyes? (White eyes are Xlinked, recessive).
Present your answers!
0%
A female carrier of colorblindness
marries a normal male. What percent of
their MALE children will be colorblind?
Colorblindness is an X-linked recessive
trait.
Present your answers!
50%
How might karyotypes be useful to
doctors?
Present your answers!
Karyotypes help doctors detect extra
or missing chromosomes, which
helps them diagnose genetic
disorders.
Explain why the father of a girl who is
colorblind must also be colorblind.
Colorblindness is an X-linked recessive
trait
Present your answers!
In order for the girl to be colorblind she must
have inherited a colorblind allele from each of
her parents. It only takes one colorblind allele to
make the father colorblind.
Which chromosomes in Figure 14–1 are
autosomes?
Present your answers!
Pairs 1-22
In the human karyotype in Figure 14–1,
how many chromosomes are shown?
Present your answers!
47
Identify the sex chromosomes in Figure
14–1. Does the karyotype show the
normal number of sex chromosomes?
Explain.
Present your answers!
XXY; no, not the normal number; there is
an extra sex chromosome
Is individual 2 in Figure 14–2
homozygous or heterozygous for free
earlobes?
Present your answers!
heterozygous
In Figure 14–2, how many children of
individuals 4 and 5 have attached
earlobes?
Present your answers!
zero
Predict the genotype and phenotype of
individual 14 in Figure 14–2.
Present your answers!
ff; attached
In Figure 14–2, are any of the children of
individuals 1 and 2 homozygous for free
earlobes?
Present your answers!
no