Chapter 4 Practice Test
Chapter 4 Practice Test
1.
Chromosomes are made up of strands of DNA.
True
False
2.
Autosomal genetic disorders can be either dominant or recessive.
True
False
3.
PKU is the most common, genetically inherited form of mental
retardation.
True
False
4.
Down syndrome is an example of a disorder related to the structure
of chromosomes.
True
False
5.
Prader-Willi syndrome is an example of a disorder related to the
structure of chromosomes.
True
False
6.
Hydrocephalus and microcephalus are examples of disorders with
unknown causes.
True
False
7.
Sturge-Weber is an example of a disorder with an unknown cause.
True
False
8.
Genetic testing procedures include amniocentesis, chorionic villus
testing, and alpha fetoprotein testing.
True
False
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9.
______refers to somatic cell division in which the chromosomes in
the nucleus duplicate themselves before dividing.
Guanine
Mitosis
Genotype
Cytosine
10. Humans have _____chromosomes that are paired together (one of
each pair comes from the biological mother and the other from the
biological father).
40
24
46
22
11. _______ and ______ are examples of dominant autosomal genetic
disorders.
PKU and Lesch-Nyhan
Tuberous sclerosis and neurofibromatosos
Fragile X and Rett syndrome
PKU and Tay Sachs
12. ________ and _________are examples of recessive autosomal
genetic disorders.
Neurofibromatosos and PKU
Tuberous sclerosis and neurofibromatosos
PKU and Tay Sachs
PKU and Lesch-Nyhan
13. Tuberous sclerosis (TS) is caused by ___________ located on either
the ninth or the sixteenth chromosome.
a nonworking gene
somatic cells
extra genes
An overactive gene
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14.
Tay Sachs disease is primarily found among the _________
population.
African-American
Hispanic
Asian
Ashkenazi Jewish
15.
The treatment for PKU is __________________.
many years of medication.
radiation therapy coupled with blood transfusions.
a diet that avoids products containing phenylalanine.
repeated blood transfusions.
16. _________ is actually the most common genetically inherited form of
CIDs.
PKU
Tay Sachs
Down syndrome
Fragile X syndrome
17. ____________ is the most common biological cause of CIDs.
PKU
Lesch-Nyhan syndrome
Down syndrome (DS)
Rett syndrome
18. The hallmark characteristic of ________ is self-injurious behavior
(head banging, self-biting, etc.) that can be quite severe and, in fact,
life threatening.
Down syndrome
Rett syndrome (RS)
Fragile X syndrome
Lesch-Nyhan syndrome (LNS )
19. The extreme obesity seen in ________ is one of its hallmark
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characteristics. Individuals are thought to have insatiable appetites
and unusual food-related behaviors such as eating nonfood products
(pica).
Williams syndrome
Jacobsen syndrome
Prader-Willi syndrome
Cri-du-Chat syndrome
20. _____________is a buildup of cerebrospinal fluid (CSF) in the brain
that results in an enlarged head.
Sturge-Weber syndrome
Microcephaly
Macrocephaly
Hydrocephaly
21.
Effective treatment for hydrocephaly involves the use of
___________.
medication.
facial reconstruction surgery.
medication and behavior therapy.
a shunt or endoscopic ventriculostomy.
22.
Hydrocephaly is one cause of _____________.
microcephaly.
Down syndrome.
Sturge-Weber syndrome.
macrocephaly.
23. _________ is a method to show various genetic combinations of
offspring of parents with known allele pairs.
Chorionic villus sampling
Bart's Test
FISH technique
Punnett Squares
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24. Discuss the reasons why an understanding of genetic and
chromosomal disorders is important.
25. What role do you think genetic counselors should play when working
with families? What controversies exist within this role?
26. List and describe at least four methods of genetic testing.
27. Discuss how Down syndrome and Fragile X syndrome are caused and
the most common characteristics of each.
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