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Chapter 15 Quiz

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
New combinations of linked genes are due to which of the following?
a.
nondisjunction
b.
crossing over
c.
independent assortment
d.
mixing of sperm and egg
e.
both A and C
 

 2. 
The reason that linked genes are inherited together is that
a.
they are located on the same chromosome.
b.
the number of genes in a cell is greater than the number of chromosomes.
c.
chromosomes are unbreakable.
d.
alleles are paired.
e.
genes align that way during metaphase I.
 

 3. 
What is the mechanism for the production of genetic recombinants?
a.
X inactivation
b.
methylation of cytosine
c.
crossing over and independent assortment
d.
nondisjunction
e.
deletions and duplications during meiosis
 
 
Use the list of chromosomal systems below to answer the following questions.

A. haploid-diploid
B. X-0
C. X-X
D. X-Y
E. Z-W
 

 4. 
What is the chromosomal system for determining sex in mammals?
a.
A
b.
B
c.
C
d.
D
e.
E
 

 5. 
What is the chromosomal system for sex determination in birds?
a.
A
b.
B
c.
C
d.
D
e.
E
 

 6. 
A man who carries an X-linked allele will pass it on to
a.
all of his daughters.
b.
half of his daughters.
c.
all of his sons.
d.
half of his sons.
e.
all of his children.
 

 7. 
A cell that has 2n + 1 chromosomes is
a.
trisomic.
b.
monosomic.
c.
aneuploid.
d.
polyploid.
e.
both A and C
 

 8. 
If a chromosome lacks certain genes, what has most likely occurred?
a.
disjunction
b.
an inversion
c.
a deletion
d.
a translocation
e.
a nonduplication
 

 9. 
The karyotype shown below is associated with which of the following genetic disorders?

chapter_15_quiz_files/i0110000.jpg

a.
Turner syndrome
b.
Down syndrome
c.
Klinefelter syndrome
d.
hemophilia
e.
male-pattern baldness
 

 10. 
Of the following human trisomies, the one that generally has the most severe impact on the health of the individual is
a.
trisomy 21.
b.
Klinefelter syndrome (XXY).
c.
trisomy X.
d.
XYY.
e.
All of the above have equal impact.
 



 
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