Download Genetics Practice Test Name: Date: 1. Which statement best

Genetics Practice Test
Date:
Name:
1.
Which statement best describes a cloned
population?
2.
A.
It is usually produced by sexual reproduction.
B.
The individual organisms usually have varying
DNA sequences.
C.
There are usually no variations in genotypes.
Select the term, chosen from the list below, that is
best described by the statement shown.
A portion of a chromosome is lost.
A.
Amniocentesis
B.
Karyotyping
C.
Deletion
D. Translocation
D. Individuals usually show a variety of
phenotypes.
3.
Patient
A
Name of Genetic Disorder
sickle-cell anemia
Characteristics of the Disorder
deterioration of the nervous system due to accumulation
of fatty material
B
Patient B has the genetic disorder known as
A.
4.
phenylketonuria
B.
Tay-Sachs
C.
Gregor Mendel developed some basic principles of
heredity by
5.
hemophilia
D. color blindness
One reason for Mendel's success with genetic
studies of garden peas was that he
A.
crossing pea plants
A.
used only hybrid pea plants
B.
cutting o
B.
used peas with large chromosomes
C.
breeding fruit ies
C.
studied large numbers of o spring
the tails of mice
D. culturing bacteria in a laboratory
D. discovered the sources of variations in peas
page 1
6.
All the heritable genes found in a population
constitute the population's
9.
A.
recessive alleles
A.
stores food
B.
chromosome mutations
B.
transmits genetic information
C.
homologous structures
C.
transmits chemical energy
D. gene pool
7.
D. stores enzymes
Which genetic concept was proposed by Mendel?
A.
chromosome nondisjunction
B.
independent assortment
C.
multiple alleles
10.
D. sex linkage
8.
Knowledge of the structure of DNA is important
in the study of life because DNA
located on separate sex chromosomes
B.
members of an allelic pair
C.
located on the same chromosome
A.
on homologous pairs of chromosomes
B.
in a DNA nucleotide
C.
in organisms that are homozygous
D. on nonhomologous chromosomes
Two genes are linked if they are
A.
Allelic pairs of genes are located only
11.
D. able to segregate at random
page 2
In humans there are 23 pairs of chromosomes.
One pair of the 23 are sex chromosomes. The
other 22 pairs are known as
A.
autosomes
B.
homozygotes
C.
heterozygotes
D. centrosomes
Genetics Practice Test
12.
CHROMOSOME THAT CARRIES
THE DOMINANT ALLELE
FOR HEIGHT
CHROMOSOME THAT CARRIES
THE RECESSIVE ALLELE
FOR HEIGHT
CHROMOSOME THAT CARRIES
THE DOMINANT ALLELE
FOR SEED SHAPE
CHROMOSOME THAT CARRIES
THE RECESSIVE ALLELE
FOR SEED SHAPE
Which statement correctly describes the location of the alleles for height and seed shape?
A.
The dominant alleles for height and seed shape are located on the same chromosome.
B.
The dominant and recessive alleles are located on the same member of a homologous pair of chromosomes.
C.
The alleles for height are located on a di erent homologous pair of chromosomes than the alleles for seed
shape.
D. The dominant alleles are located on one pair of homologous chromosomes and the recessive alleles are located
on another pair of homologous chromosomes.
13.
Which diagram represents those chromosomes that are responsible for the heterozygous genotype for height?
A.
B.
C.
page 3
D.
Genetics Practice Test
14.
Traits that are controlled by genes found on an
X-chromosome are said to be
A.
autosomal dominant
B.
autosomal recessive
C.
codominant
16.
Which diagram represents a pair of homologous
chromosomes?
A.
D. sex-linked
B.
C.
15.
While working with pea plants, Gregor Mendel
observed that some tall plants had yellow seeds
while other tall plants had green seeds. This
observation is best explained by
A.
nondisjunction of chromosomes
B.
linkage of genes
C.
independent assortment
D.
D. intermediate inheritance
page 4
Genetics Practice Test
17.
The diagram shown represents a pair of
homologous autosomes. The letters B and b
represents genes for a certain trait. These letters
also represent
A.
an allelic pair of genes
B.
linked genes
C.
genes for sex determination
19.
20.
If an adenine nucleotide is deleted from a
nucleotide sequence in a DNA molecule, the result
is a
A.
clone
B.
C.
polypeptide
D. hybrid
Base your answer(s) to the following question(s)
on the information and diagram below and on
your knowledge of biology.
In cats, gene E produces yellow fur and
gene B produces black fur. A cat that inherits
both of these genes has patches of yellow
and black fur and is known as a calico. The
alleles for black or yellow are located on
the X-chromosome. The cross X B Y X B X E
is illustrated in the square below.
D. homozygous genes
18.
Yellow male o spring are represented by
A mother with type B blood and a father with
type A blood have four children, each with a
di erent blood type. The best explanation for the
occurrence of the four di erent blood types of the
children is that blood type is
A.
only determined by dominant alleles
B.
determined by multiple alleles
C.
in uenced by environmental conditions
mutation
A.
21.
D. a sex-linked trait
B.
2
C.
3
D. 4
In humans, the gene for polydactyly (having extra
ngers or toes) is dominant over the gene for the
normal number of digits. If parents who are both
homozygous dominant for polydactyly have four
children, how many of these children would most
likely have extra ngers or toes?
A.
page 5
1
0
B.
2
C.
3
D. 4
Genetics Practice Test
22.
Base your answer(s) to the following question(s) on
the pedigree chart below, which shows a history of
ear lobe shape, and on your knowledge of biology.
25.
A human hereditary disorder that may result in
mental retardation is
A.
phenylketonuria
B.
hemophilia
C.
sickle-cell anemia
D. albinism
The genotype of individual 1 could be
23.
24.
A.
EE, only
B.
Ee, only
C.
ee
D. EE or Ee
26.
In which hereditary disease do the abnormal
hemoglobin molecules di er from normal
hemoglobin molecules by only a single amino
acid?
A.
hemophilia
B.
albinism
C.
phenylketonuria
D. sickle-cell anemia
The genotype of individual 2 could be
A.
EE, only
B.
Ee, only
C.
ee
D. EE or Ee
27.
The charts show human chromosomes arranged in
pairs.
Which combination of techniques can be used
before birth to detect chromosomal abnormalities?
A.
ultracentrifugation and chromatography
B.
screening and vaccination
C.
blood typing and vaccination
The chromosome numbered 1 through 22 are
known as
D. amniocentesis and karyotyping
page 6
A.
ribosomes
B.
lysosomes
C.
centrosomes
D. autosomes
Genetics Practice Test
28.
29.
The preparation of these charts for individuals A
and B is known as
A.
microsurgery
B.
C.
blood typing
D. chemical screening
30.
karyotyping
A change in the sequence of nitrogenous bases in
DNA may result in
A.
a gene mutation
B.
sex linkage
C.
polyploidy
D. nondisjunction
Which genetic disorder in individual A is indicated
by the number of chromosomes labeled 21?
A.
phenylketonuria (PKU)
B.
Tay-Sachs
C.
sickle-cell anemia
D. Down's syndrome
Techniques for Detecting
Genetic Disorders
31.
(1) Karyotyping
(2) Urinalysis
(3) Blood Analysis
(4) Amniocentesis
Which two techniques would most likely be involved in the prenatal detection of Down's syndrome?
A.
1 and 2
B.
2 and 3
C.
page 7
1 and 4
D. 1 and 3
Genetics Practice Test
32.
From which area would uid be removed to detect
genetic disorders by amniocentesis?
34.
Persons su ering from sickle-cell anemia have
abnormally shaped red blood cells. This condition
is most likely caused by
A.
a diet with insu cient iron
B.
the lack of an enzyme necessary for proper
protein metabolism
C.
the lack of su cient calcium in bones that
produce red blood cells
D. hemoglobin molecules that do not contain the
normal sequence of amino acids
A.
A
B.
B
C.
C
D. D
35.
33.
Tay-Sachs is a genetic disorder characterized by a
deterioration of the
A.
circulatory system
B.
nervous system
C.
excretory system
D. endocrine system
Select the technique, chosen from the list below,
that is best described by the statement shown.
This technique is used to withdraw some of
the uid and cells surrounding a fetus.
A.
Amniocentesis
B.
Cloning
C.
Genetic engineering
36.
D. Karyotyping
page 8
An analysis of chromosomes may show the loss
of a portion of a chromosome. This type of
chromosomal change is known as
A.
nondisjunction
B.
an addition
C.
translocation
D. a deletion
Genetics Practice Test
37.
38.
The individual from whom these chromosomes
were taken is a
A.
male
B.
C.
hermaphrodite
D. polyploid
39.
female
Examination of the diagram indicates that these
are the chromosomes of a
A.
female with Down syndrome
B.
male with Down syndrome
C.
female without Down syndrome
D. male without Down syndrome
The chart represents the inheritance of Tay-Sachs
disease in a family.
40.
Answer the following question(s) based on the
chart shown and on your knowledge of biology.
What are the genotypes of individuals A and B
with regard to Tay-Sachs disease?
A.
One must be homozygous dominant and the
other must be homozygous recessive.
B.
One must be homozygous dominant and the
other must be heterozygous.
C.
Both must be homozygous.
A trait appears in six out of seven boys in
a particular family, but in one of the girls.
Which pattern of heredity is suggested by this
information?
A.
incomplete dominance
B.
multiple alleles
C.
independent assortment
D. sex linkage
D. Both must be heterozygous.
page 9
Genetics Practice Test
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Genetics Practice Test
09/28/2016
1.
Answer:
C
21.
Answer:
D
2.
Answer:
C
22.
Answer:
D
3.
Answer:
B
23.
Answer:
C
4.
Answer:
A
24.
Answer:
D
5.
Answer:
C
25.
Answer:
A
6.
Answer:
D
26.
Answer:
D
7.
Answer:
B
27.
Answer:
D
8.
Answer:
C
28.
Answer:
B
9.
Answer:
B
29.
Answer:
D
10.
Answer:
A
30.
Answer:
A
11.
Answer:
A
31.
Answer:
C
12.
Answer:
C
32.
Answer:
D
13.
Answer:
A
33.
Answer:
A
14.
Answer:
D
34.
Answer:
D
15.
Answer:
C
35.
Answer:
B
16.
Answer:
B
36.
Answer:
D
17.
Answer:
A
37.
Answer:
A
18.
Answer:
B
38.
Answer:
D
19.
Answer:
B
39.
Answer:
D
20.
Answer:
D
40.
Answer:
D