Name: 
 

Chapter 14



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. 

The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because
a.
one allele was completely dominant over another.
b.
each allele affected phenotypic expression.
c.
the traits blended together during fertilization.
d.
no genes interacted to produce the parental phenotype.
e.
different genes interacted to produce the parental phenotype.
 

 3. 

What is genetic cross between an individual showing a dominant phenotype (but of unknown genotype) and a homozygous recessive individual called?
a.
a self-cross
b.
a testcross
c.
a hybrid cross
d.
an F1 cross
e.
a dihybrid cross
 

 4. 

Two characters that appear in a 9:3:3:1 ratio in the F2 generation should have which of the following properties?
a.
Each of the characters is controlled by a single gene.
b.
The genes controlling the characters obey the law of independent assortment.
c.
Each of the genes controlling the characters has two alleles.
d.
Only A and C are correct.
e.
A, B, and C are correct.
 

 5. 

A sexually reproducing animal has two unlinked genes, one for head shape (H). and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism?
a.
HT
b.
Hh
c.
HhTt
d.
T
e.
tt
 

 6. 

Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that
a.
new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1.
b.
the mechanism controlling the appearance of traits was different between the F1 and the F2 plants.
c.
traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1.
d.
the traits were lost in the F1 due to blending of the parental traits.
e.
members of the F1 generation had only one allele for each character, but members of the F2 had two alleles for each character.
 

 7. 

In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?
a.
1/2
b.
1/4
c.
0
d.
1
e.
1/6
 

 8. 

A couple has three children, all of whom have brown eyes and blond hair. Both parents are homozygous for brown eyes (BB) but one is a blond (rr) and the other is a redhead (Rr). What is the probability that their next child will be a brown-eyed redhead?
a.
1/16
b.
1/8
c.
1/4
d.
1/2
e.
1
 
 
Use the following information to answer the questions below.

A woman who has blood type A, has a daughter who is type O positive and a son who is type B negative. Rh positive is a simple dominant trait over Rh negative.
 

 9. 

Which of the following is a possible genotype for the son?
a.
IBIB
b.
IBIA
c.
ii
d.
IBi
e.
IAIA
 

 10. 

Which of the following is a possible genotype for the mother?
a.
IAIA
b.
IBIB
c.
ii
d.
IAi
e.
IAIB
 

 11. 

Which of the following is a possible phenotype for the father?
a.
A
b.
O
c.
B
d.
AB
e.
impossible to determine
 
 
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
 

 12. 

the ability of a single gene to have multiple phenotypic effects
a.
A
b.
B
c.
C
d.
D
 

 13. 

the ABO blood group system
a.
A
b.
B
c.
C
d.
D
 

 14. 

the phenotype of the heterozygote differs from the phenotypes of both homozygotes
a.
A
b.
B
c.
C
d.
D
 

 15. 

cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections
a.
A
b.
B
c.
C
d.
D
 



 
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