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Genetics Test

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 
 
nar005-1.jpg
Figure 11
 

 1. 

Refer to Figure 11. A man and a woman want to have a child, but the man is heterozygous (Cc) for a recessive trait that causes a fatal illness. What is the probability of a child’s inheriting the trait?
a.
25%
b.
75%
c.
0%
d.
50%
 
 
nar003-1.jpg
Figure 13
 

 2. 

Refer to Figure 13. Bird A has the genotype ll for bill length, and Bird B is LL. The bills of their offspring would be:
a.
long in 100% of the offspring.
b.
short in 100% of the offspring.
c.
long in 50% of the offspring.
d.
short in 75% of the offspring.
 
 
nar004-1.jpg
Figure 10
 

 3. 

Refer to Figure 10. Some members of this family have a certain trait. The female represented by the label A
a.
has the trait.
b.
is homozygous dominant for the trait.
c.
is homozygous recessive for the trait.
d.
carries the trait.
 

 4. 

Blood type in humans is controlled by ____ alleles.
a.
two
c.
four
b.
three
d.
one
 

 5. 

In a Punnett square, a capital letter stands for a ____ allele.
a.
heterozygous
c.
recessive
b.
homozygous
d.
dominant
 
 
nar001-1.jpg
Figure 6
 

 6. 

Refer to Figure 6. A heterozygous orange-flowered plant is crossed with a homozygous purple-flowered plant. If orange is a dominant allele and purple is recessive, what color ratio will the flowers of the offspring plants have?
a.
4 purple: 0 orange
b.
1 purple: 3 orange
c.
2 purple: 2 orange
d.
0 purple: 4 orange
 

 7. 

The study of ____ is called genetics.
a.
mutations
c.
pea plants
b.
dominance
d.
heredity
 
 
nar002-1.jpg
Figure 8
 

 8. 

Refer to Figure 8. In this cross between two pea plants, the offspring are:
a.
100% smooth.
b.
75% wrinkled and 25% smooth.
c.
50% smooth and 50% wrinkled.
d.
75% smooth and 25% wrinkled.
 

 9. 

A Punnett square shows you all the ways in which ____ can combine.
a.
eggs
c.
colors
b.
alleles
d.
sperm
 

 10. 

A ____ is part of the DNA code on a chromosome.
a.
gender
c.
phenotype
b.
gene
d.
genotype
 

 11. 

Of the following, which represents a homozygous recessive genotype?
a.
Tt
c.
tt
b.
TT
d.
TTT
 

 12. 

Mendel developed the principle of independent ____ to understand how traits are passed through generations.
a.
assortment
c.
breeding
b.
generations
d.
heredity
 

Matching
 
 
Match each statement with the correct item below.
a.
organism that always produces the same traits in its offspring
b.
study of heredity
c.
when there are two alleles that are exactly the same
d.
a factor that covers up another factor
e.
the different forms a gene has for a trait
 

 13. 

genetics
 

 14. 

purebred
 

 15. 

dominant factor
 

 16. 

homozygous
 

 17. 

allele
 

Completion
Complete each statement.
 

 18. 

An organism's genetic makeup is called its ____________________.
 

 

 19. 

When two of the same alleles are needed to be seen in the offspring's genotype, those alleles are ____________________.
 

 

 20. 

A human baby has two X chromosomes. Its sex is _______________.
 

 



 
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