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Chapter 14 Quiz

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

 1. 
A plant with purple flowers is allowed to self-pollinate. Generation after generation, it produces purple flowers. This is an example of
a.
hybridization.
b.
incomplete dominance.
c.
true-breeding.
d.
the law of segregation.
e.
polygenetics.
 

 2. 
What is the difference between a monohybrid cross and a dihybrid cross?
a.
A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
b.
A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.
c.
A monohybrid cross involves organisms that are heterozygous for a single character, whereas a dihybrid cross involves organisms that are heterozygous for two characters.
d.
A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.
e.
A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio.
 

 3. 
A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
a.
the blending model of genetics.
b.
true-breeding.
c.
dominance.
d.
a dihybrid cross.
e.
the mistakes made by Mendel.
 

 4. 
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This suggests
a.
that the parents were true-breeding for contrasting traits.
b.
incomplete dominance.
c.
that a blending of traits has occurred.
d.
that the parents were both heterozygous.
e.
that each offspring has the same alleles.
 

 5. 
A 9:3:3:1 phenotypic ratio is characteristic of which of the following?
a.
a monohybrid cross
b.
a dihybrid cross
c.
a trihybrid cross
d.
linked genes
e.
both A and D
 
 
Use the diagram and description below to answer the following question.

In a particular plant, leaf color is controlled by gene D. Plants with the dominant allele D have dark green leaves, and plants with the homozygous recessive dd genotype have light green leaves. A true-breeding dark-leaved plant is crossed with a light-leaved one, and the F1 offspring is allowed to self-pollinate. The predicted outcome of this cross is diagrammed in the Punnett square shown below, where 1, 2, 3, and 4 represent the genotypes corresponding to each box within the square.

chapter_14_quiz_files/i0070000.jpg
 

 6. 
Which of the boxes marked 1-4 correspond to plants with dark leaves?
a.
1 only
b.
1 and 2
c.
2 and 3
d.
4 only
e.
1, 2, and 3
 
 
Use the terms listed below to answer the following questions. Each term may be used once, more than once, or not at all.

A. incomplete dominance
B. multiple alleles
C. pleiotropy
D. epistasis
 

 7. 
the ability of a single gene to have multiple phenotypic effects
a.
A
b.
B
c.
C
d.
D
 
 
Use the answers below to answer the following questions. Each answer may be used once, more than once, or not at all.

A. Huntington's disease
B. Tay-Sachs disease
C. phenylketonuria
D. cystic fibrosis
E. sickle-cell disease
 

 8. 
Substitution of the "wrong" amino acid in the hemoglobin protein results in this disorder.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 9. 
This is caused by a dominant single gene defect and generally does not appear until the individual is 35-45 years of age.
a.
A
b.
B
c.
C
d.
D
e.
E
 



 
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