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7th Grade Chapter 4 Test-Modified

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

 1. 

Of the following, which is NOT a human blood phenotype?
a.
O
c.
AB
b.
C
 
 
nar002-1.jpg
Figure 8
 

 2. 

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

 3. 

Blood type in humans is controlled by ____ alleles.
a.
three
c.
two
b.
one
 
 
nar003-1.jpg
Figure 13
 

 4. 

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.
long in 50% of the offspring.
c.
short in 100% of the offspring.
 
 
nar004-1.jpg
Figure 11
 

 5. 

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.
0%
c.
50%
 

 6. 

Of the following, which represents a homozygous recessive genotype?
a.
tt
c.
TT
b.
Tt
 
 
nar001-1.jpg
Figure 6
 

 7. 

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.
1 purple: 3 orange
b.
2 purple: 2 orange
c.
4 purple: 0 orange
 

 8. 

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

 9. 

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

 10. 

In a Punnett square, a capital letter stands for a ____ allele.
a.
homozygous
c.
recessive
b.
dominant
 

Matching
 
 
Match each term with the correct description below.
a.
genetics
d.
dominant factor
b.
homozygous
e.
alleles
c.
purebred
 

 11. 

organism that always produces the same traits in its offspring
 

 12. 

study of heredity
 

 13. 

when there are two alleles that are exactly the same
 

 14. 

a factor that covers up another factor
 

 15. 

the different forms a gene has for a trait
 

Completion
Complete each statement.
 

 16. 

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

 

 17. 

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

 

 18. 

An organism's genetic makeup is called its ____________________.
 

 



 
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