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Multiple Choice Quiz
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1

In order to ensure he had true-breeding plants for his experiments Mendel
A)cross-fertilized each variety with another.
B)let each variety self-fertilize for several generations.
C)removed the female parts of the flowers to prevent cross-fertilization.
D)removed the male parts of the flowers to prevent cross-fertilization.
E)used numerous varieties of garden peas.
2

When Mendel crossed two varieties of true-breeding plants the F1 generation were
A)homozygous for one trait or the other.
B)heterozygous.
C)of a phenotype midway between the parent plants.
D)phenotypically similar to the parent plant with the dominant trait.
E)both b and d
3

In a particular breed of cats black (B) is dominant and white (b) is recessive. What are the chances of producing white kittens when crossing a Bb male with a bb female?
A)0%
B)25%
C)50%
D)75%
E)100%
4

What are the chances of producing black kittens from the above cross?
A)0%
B)25%
C)50%
D)75%
E)100%
5

When doing dihybrid crosses Mendel found the F2 generation showed a 931 ratio of phenotypes.
A)true
B)false
6

Mendel's second law is often stated as genes located on different chromosomes are inherited independently each other.
A)true
B)false
7

An Rh-negative mother pregnant with an Rh-positive child in her first pregnancy will
A)produce "anti-Rh" antibodies that will cause clotting of her fetuses blood cells.
B)produce "anti-Rh" antibodies that will cause clotting of any future Rh-positive fetuses blood cells.
C)experience a life-threatening allergic response.
D)develop tolerance to the Rh-antigen.
E)will be required to take medication throughout her pregnancy to prevent clotting of her blood cells.
8

In polygeny, one gene affects many traits.
A)true
B)false
9

In pleiotrophy, one gene affects many traits.
A)true
B)false
10

The significance of Morgan's experiments was that
A)it presented the first clear evidence that genes determining Mendelian traits do reside on chromosomes.
B)it illustrated the effects of polygenic traits on the inheritance of sex-linked traits.
C)chromosomal reduction through meiosis was proven.
D)a method to control economically important fruit flies resulted.
E)both a and d
11

Sickle-cell anemia:
A)poor blood circulation due to abnormal hemoglobin molecules.
B)brain fails to develop in infancy.
C)failure of blood to clot.
D)failure of chloride ion transport mechanism.
12

Cystic fibrosis:
A)poor blood circulation due to abnormal hemoglobin molecules.
B)brain fails to develop in infancy.
C)failure of blood to clot.
D)failure of chloride ion transport mechanism.
13

Hemophilia:
A)poor blood circulation due to abnormal hemoglobin molecules.
B)brain fails to develop in infancy.
C)failure of blood to clot.
D)failure of chloride ion transport mechanism.
14

Phenylketonuria:
A)poor blood circulation due to abnormal hemoglobin molecules.
B)brain fails to develop in infancy.
C)failure of blood to clot.
D)failure of chloride ion transport mechanism.
15

Hemophilia involving a lack of blood protein factors VIII and IX are
A)a dominant trait that usually only develops in individuals in their 30s.
B)a recessive trait inherited on autosomes.
C)a sex-linked trait.
D)common in royal families due to several mutations in their genetic material.
E)a dominant trait inherited on autosomes.
16

Ultrasound:
A)cells are removed and grown in culture.
B)technique that can be used as early as eight weeks in pregnancy and yields rapid results.
C)used to examine fetus for major abnormalities.
17

Amniocentesis:
A)cells are removed and grown in culture.
B)technique that can be used as early as eight weeks in pregnancy and yields rapid results.
C)used to examine fetus for major abnormalities.
18

Chorionic villi sampling:
A)cells are removed and grown in culture.
B)technique that can be used as early as eight weeks in pregnancy and yields rapid results.
C)used to examine fetus for major abnormalities.
19

Garden peas were a good subject for Mendel's genetic studies because
A)they are available in many varieties.
B)they are small, easy to grow plants.
C)it is easy to control their fertilization.
D)they mature quickly.
E)all of the above
20

To conduct genetic experiments it is necessary to begin with subjects that are
A)haploid.
B)heterozygous.
C)true-breeding.
D)easy to count.
E)previously unstudied.
21

During your plant research project, you cross a blue-flowered variety with a yellow-flowered variety. The F1 generation consists of all yellow-flowered plants. The yellow-flowered plants are probably
A)recessive.
B)dominant.
C)incomplete dominant.
D)sterile.
E)hybrid.
22

In the experiment mentioned above the purple-flowered plants are probably
A)recessive.
B)dominant.
C)incomplete dominant.
D)sterile.
E)hybrids.
23

In the experiment mentioned above what would you expect to see in the F2 generation?
A)all yellow-flowered plants
B)all purple-flowered plants
C)yellow-flowered and purple-flowered plants
D)plants with an intermediate color between yellow and purple
E)none of the above
24

Which of the following represents an individual that is homozygous for the dominant trait?
A)bb
B)Bb
C)BB
D)aa
E)Aa
25

Which of the following represents an individual that is heterozygous for the dominant trait?
A)bb
B)Bb
C)BB
D)Aa
E)AA
26

Two common coat colors seen in Shetland sheepdogs (shelties) are sable and tricolor. Sable dogs (B) are blonde and tricolored dogs (b) are black with a white collar and tan eyebrows. Sable is the dominant color; tricolor is recessive. A dog that is heterozygous for coat color (Bb) is called a tri-factored sable and is darker than a dog that is homozygous for sable (BB). What are the possible coat colors in a litter that results from a cross between a homozygous sable and a tri-factored sable?
A)all sable puppies
B)all tricolored puppies
C)both sable and tricolored puppies
D)sable and tri-factored sable puppies
E)all tri-factored sable puppies
27

What coat colors are possible from a cross between a sable and a tricolored dog?
A)all sable puppies
B)all tricolored puppies
C)both sable and tricolored puppies
D)sable and tri-factored sable puppies
E)all tri-factored sable puppies
28

A tri-factored sheltie has a litter of puppies. Two of the pups are tricolored and the other two are tri-factored. What color was the father of the puppies?
A)sable
B)tricolored
C)tri-factored
D)either a or b
E)either b or c
29

If the tri-factored sheltie had one sable puppy and three tri-factored puppies, then the father would have been what color?
A)sable
B)tricolored
C)tri-factored
D)either a or b
E)either b or c
30

A cross between two individuals results in a ratio of 9331 of four possible phenotypes. This is an example of a(n)
A)monohybrid cross.
B)dihybrid cross.
C)testcross.
D)incomplete dominance.
E)none of the above
31

When a trait is controlled by the interaction of the products of two genes it is referred to as
A)dominance.
B)pleiotropy.
C)epistasis.
D)incomplete dominance.
E)aneuploidy.
32

The tri-factored shelties mentioned earlier are an example of
A)dominance.
B)pleiotropy.
C)epistasis.
D)incomplete dominance.
E)aneuploidy.
33

A DNA molecule that is complexed with proteins into a rodlike structure is called a(n)
A)chromophore.
B)chromosome.
C)genophore.
D)genome.
E)genosome.
34

The end result of meiosis in human males is
A)two diploid sperm cells.
B)four diploid sperm cells.
C)two haploid sperm cells.
D)four haploid sperm cells.
E)none of the above
35

__________ is (are) a significant source of genetic recombination during gamete production.
A)Mutation
B)Crossing-over
C)Nondisjunction
D)Controlled assortment
E)Both a and c
36

Which of the following is a result of nondisjunction of chromosomes during gamete formation?
A)cystic fibrosis
B)Down syndrome
C)Turner's syndrome
D)sickle-cell anemia
E)both b and c
37

A Barr body is a(n)
A)inactivated X chromosome.
B)inactivated Y chromosome.
C)an abnormality seen in the cells of persons with Down syndrome.
D)chromosome 21 trisomy complex.
E)none of the above





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