Name _______________________________ Date __________________
SOL 7.13
1. When using Punnett squares to
show inherited probability, what
does a capital letter stand for?
A
B
C
D
a dominant gene
a recessive gene
a hybrid gene
an incomplete gene
2. What is a trait that is the “weaker”
of two traits called?
A
B
C
D
a dominant trait
an incomplete trait
a hybrid trait
a recessive trait
3. Which chromosome combination
is that of a male in humans?
A
B
C
D
YY
XY
XX
yy
4. What is the number of
chromosomes in a human sex
cell?
A
B
C
D
24 (12 pairs)
46 (23 pairs)
64 (32 pairs)
92 (46 pairs)
5. In the process of meiosis, what
cellular material is divided in
half?
A
B
C
D
the messenger RNA
recessive traits
the DNA
the dominant traits
6. Two hybrid fruit flies each have
one dominant gene for brown
eyes (B) and one recessive gene
for red eyes (b). They are mated.
What percent of the offspring
have brown eyes?
A
25%
B
50%
C
75%
D 100%
Punnett Square
7. A scientist is trying to prevent a
disease in plants. In her research,
she removes a gene from the
plant and places it into a bacterial
cell. This bacterial cell begins to
make a large amount of the plant
protein. What is the process
called that the scientist used?
A
B
C
D
cross pollination
selective breeding
reproduction
genetic engineering
8. In squirrels, the gray fur gene (G)
is dominant and the gene for
black fur (g) is recessive. If 50%
of a squirrel litter is black, what
parental cross probably produced
this result?
A
B
C
D
GG x GG
gg x gg
Gg x Gg
Gg x gg
Punnett Square
_______________________________________________________________________________________________________
Copyright©1999,2000 S.S. Flanagan & D.E. Mott
45
Do not reproduce without permission. 07-15-00
Name _______________________________ Date __________________
SOL 7.13
9. Which of these conditions is
probably NOT the result of a
genetic mutation?
A
B
C
D
Down’s syndrome
sickle-cell anemia
AIDS
cystic-fibrosis
10. If “S” stands for a dominant form
of the “smooth” gene in a plant
(producing smooth leaves), and
“s” stands for a recessive form of
the “smooth” gene (producing
wrinkled leaves), what gene
structure would a hybrid plant
have?
12. Which of the following individuals
is best known for work in the field
of heredity or genetics?
A
B
C
D
Gregor Mendel
Ivan Pavlov
Anton von Leeuwenhoek
Robert Hooke
13. DNA is composed of:
A
B
C
D
glucose molecules.
fatty acids.
amino acids.
nucleotides.
14. What is true about mutations?
A
B
C
D
SS
Ss
ss
S
A
B
C
D
They occur randomly.
They occur on a regular basis.
They appear every other generation.
They are usually beneficial to the
organism.
11. What is the process of cloning?
A The breeding of a new type of
organism by artificially uniting an
egg and a sperm.
B The creation of a new individual
organism from the tissue of a single
adult.
C Combining either two eggs or two
sperm together to produce a new
organism.
D Breeding a mixture of two different,
but related, species.
_______________________________________________________________________________________________________
Copyright©1999,2000 S.S. Flanagan & D.E. Mott
46
Do not reproduce without permission. 07-15-00
Name _______________________________ Date __________________
SOL 7.13
The Punnett squares below show the
results of mating peas that have
traits for a round shape or a wrinkled
shape. The gene for the round shape
is dominant. Use the Punnett squares
to answer the next four questions.
Generation 1:
Both parents
purebred
Generation 2:
Both parents
hybrid
R
R
r
Rr
Rr
r
Rr
Rr
R
r
R
RR
Rr
r
Rr
rr
15. In the second generation, what
portion of the peas look rounded?
A
B
C
D
half
three-fourths
one fourth
none of the above
16. In the second generation, what
portion of the peas is purebred?
A
B
C
D
one half
none
one fourth
all
17. In the first generation, what
portion of the peas is rounded?
A
B
C
D
18. Each row and column is labeled
with a letter. What does each
letter stand for?
A
B
C
D
a recessive trait in each gene
a gene for round traits
a gene for round or wrinkle traits
a dominant trait in each gene
19. If red four-o’clock flowers were
crossed with white four-o’clock
flowers, what color offspring
would be produced?
A all pink flowers
B red flowers, pink flowers, and white
flowers
C red flowers and white flowers
D not enough information
20. A sudden change in a
characteristic caused by a change
in a gene or a chromosome is
called a(n):
A
B
C
D
alteration.
variation.
mutation.
assortment.
21. When purebreding tall plants are
crossed with hybrid tall plants,
the offspring are:
A
B
C
D
all tall plants.
all short plants.
some tall and some short plants.
not enough information.
one fourth
one half
all
none
_______________________________________________________________________________________________________
Copyright©1999,2000 S.S. Flanagan & D.E. Mott
47
Do not reproduce without permission. 07-15-00