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Multiple Choice Quiz
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1
Genes are segments of DNA that code for the _____.
A)trait of hair color
B)synthesis of proteins
C)muscle contraction
D)the function of insulin
2
Which of the following is not true of chromosomes?
A)contain DNA
B)coated with histones
C)46 in mitotic cells
D)visible at all times
3
The genes for cystic fibrosis are located on chromosome number _____.
A)4
B)7
C)17
D)21
4
Huntington disease is associated with chromosome _____.
A)4
B)7
C)17
D)21
5
When does the chromosome number reach 92?
A)never
B)prophase
C)before prophase
D)metaphase
6
Persons with dark skin who produce offspring with the same color have genes that are probably _____.
A)heterozygous for melanin
B)different alleles
C)heterozygous for melanin enzymes
D)homozygous for melanin enzymes
7
Which organ system is not significantly affected by Cystic fibrosis?
A)nervous
B)pulmonary
C)gastrointestinal
D)reproductive
8
The term __________ refers to having two different gene alleles.
A)homozygous
B)heterozygous
C)autosomal
D)karyotype
9
Sickle cell genes are present in _____% of the American population with central African ancestry.
A)8
B)18
C)48
D)2
10
The genes for sickle cell anemia are inherited as a form of _____.
A)heterozygous recessive
B)autosomal recessive
C)incomplete dominance
D)codominance
11
When will a person with sickle cell trait develop symptoms?
A)every day
B)under hypoxia
C)never
D)exercising
12
The genes for the ABO blood types are _____.
A)alleles
B)incomplete dominant
C)codominant
D)recessive
13
Persons with blood type B have the _____ agglutinogens (antigen).
A)A
B)B
C)A and B
D)neither A or B
14
Which blood type could these parents not produce in their children, AO and BB?
A)B
B)AB
C)Rh+
D)O
15
The final height of a child is determined by _____.
A)the height of the parents
B)the height of the grandparents
C)polygenic inheritance
D)recessive inheritance
16
Which of the following affects the expression in an individual with a homozygous recessive trait?
A)the health of the mother
B)disease in the father
C)diet
D)all of these
17
The result of meiosis is to produce _____.
A)the zygote
B)23 chromosomes
C)46 chromosomes
D)oogonia
18
Which term refers to the inheritance of traits that require two genes?
A)phenotype
B)genotype
C)recessive
D)dominant
19
When a physician questions a patient about their family history, they are gathering evidence to construct a___________.
A)diagnosis
B)prognosis
C)pedigree
D)Punnett square
20
How is familial hypercholesterolemia usually inherited?
A)incomplete dominance
B)codominant
C)recessive
D)sex-linked
21
Diseases that display different symptoms and signs for the same disease are displaying ____.
A)heterogeneity
B)pleiotropy
C)penetrance
D)polygenicity
22
The SRY gene causes expression of ____ chromosome genes.
A)X
B)Y
C)autosome
D)X or Y
23
Traits only transferred from fathers to their sons are associated with the ___ chromosome.
A)X
B)Y
C)number 13
D)number 21
24
Which of these conditions is usually not found in females?
A)blood clotting disorders
B)acromegaly
C)muscular dystrophy
D)Duchenne dystrophy
25
The growth of facial hair is an example of ___________.
A)sex-linked inheritance
B)sex-limited trait expression
C)sex-influenced inheritance
D)dominant genetics
26
What is the probability of there being a recessive gene in the gametes from a parent who is Aa (assuming "a" is recessive)?
A)10%
B)25%
C)50%
D)75%
27
Which offspring result from Aa and aa parents?
A)all aa
B)all AA
C)AA, Aa, Aa, aa
D)aa, aa, Aa, Aa
28
The inheritance of maleness is caused by a _____ chromosome pattern.
A)autosomal
B)Y
C)XY
D)XX
29
Which type of condition can only be passed from the father to his sons?
A)sex linked recessive
B)sex linked dominant
C)holandric
D)autosomal
30
Which of the following is not an X-linked recessive condition?
A)hemophilia A
B)color blindness
C)von Willebrand's
D)optic atrophy
31
The condition _____ is characterized by a deficiency of plasma thromboplastin component (factor IX).
A)hepatocarcinoma
B)microphthalmia
C)hemophilia B
D)coloboma iridis
32
Which term is correctly used to describe all Down's person's?
A)aneuploidy
B)trisomy 21
C)polyploidy
D)translocation
33
Which of the following is associated with Down's syndrome?
A)XO
B)XYY
C)21, 21, 21
D)trisomy 22
34
The term for prenatal genetic testing using sloughed-off fetal cells is called ____.
A)AFP
B)amniocentesis
C)chorionic villus sampling
D)CEA
35
Which of the following is not usually seen in Down's syndrome?
A)kidney defects
B)heart defects
C)skeletal deformities
D)mental retardation







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