Unit 3 – Evolution, Heredity and Genetics – Quiz 3 – 7.L.2.2
Name
1.
__________
___________________________________
A Punnett square can be used to determine
A. the probability of inherited traits
B. the gender of offspring
__________Block:______________
C. whether a baby will have red hair
D. a person’s interests
The diagram to the right shows a Punnett square.
A = curly hair (dominant)
a= straight hair (recessive)
2.
Which choice represents the genetic makeup of the parents?
A. AA and aa
B. AA and AA
C. Aa and Aa
D. AA and Aa
3.
Which choice represents a possible genotype of an offspring?
A. AA
B. Aa
C. aa
D. Aaa
4.
Humans can have blue or brown eyes. Brown eyes are the dominant trait, and blue
eyes are the recessive trait. Fill in the Punnett Square for a cross between a browneyed parent (BB) and a blue-eyed parent (bb).
5.
a
a
A
Aa
Aa
A
Aa
Aa
B
B
b
b
Plants can have either white or red flowers. Red flowers are the dominant trait, and
white flowers are the recessive trait. Fill in the Punnett Square for a cross between a
red flower (with one dominant and one recessive gene) and a white flower.
Use the Punnett Square to the right to answer the questions:
6.
How many of the offspring will show a dominant trait?
A.
4 out of 4
C.
0 out of 4
B.
1 out of 4
D.
3 out of 4
7.
How many of the offspring will show a recessive trait?
A.
4 out of 4
C.
0 out of 4
B.
1 out of 4
D.
3 out of 4
a
a
A
A
Aa
Aa
Aa
Aa
Use the Punnett Square to the right to answer the questions:
8.
9.
N
How many of the offspring will show a dominant trait?
A.
25%
c.
50%
B.
100%
d.
0%
How many of the offspring will show a recessive trait?
a.
25%
c.
75%
b.
100%
d.
50%
n
n
n
Nn
nn
Nn
nn
Use the Punnett Square below to answer the following questions:
10.
11.
B= is dominant for brown eyes, and b= is recessive for brown eyes (blue eyes)
How many offspring will have brown eyes?
A. 1 out of 4 will have brown eyes (25%)
C. 2 out of 4 will have brown eyes (50%)
B. 3 out of 4 will have brown eyes (75%)
D. 3 out of 4 will have blue eyes (75%)
How many offspring in the Punnett Square above will have blue eyes?
A. 1 out of 4 will have blue eyes
C. 2 out of 4 will have blue eyes
B. 3 out of 4 will have blue eyes
D. 3 out of 4 will have brown eyes
B
b
B
BB
Bb
b
Bb
bb
12.
For the Punnett square to the right, assume A = curly hair (dominant) and
a= straight hair (recessive). What are the chances the offspring of these parents will
have curly hair? (Assume wavy hair is not an option)
A. 25%
B. 0%
C. 100%
D. 50%
a
a
A
Aa
Aa
A
Aa
Aa
13.
In screech owls, red feathers(R) are dominant over gray feathers (r). If two hybrid, Rr,
red-feathered owls are mated, what percentage of their offspring would be expected
to have red feathers?
[Draw a Punnett square to help find the answer.] 
A. 25%
B. 100%
C. 75%
D. 50%
14.
In chickens, a rose comb (R) is dominant over single comb (r). When a hybrid, Rr, rose-combed
rooster is mated with a single-combed rr hen, what combination will be shown in the offspring?
[Draw a Punnett square to help find the answer.] 
A.
B.
C.
D.
100% rose-combed
75% rose-combed and 25% single-combed
100% single-combed
50% rose-combed and 50% single-combed
15.
In watermelon plants, the gene for solid green coat (G) is dominant over the gene for striped coat (g). A pure
(GG) green watermelon plant is crossed with a hybrid (Gg) green watermelon plant.
What percent of the offspring will have striped coats?
A.
25%
B.
100%
C.
0%
D.
50%
16.
In chickens, a genetic trait called feathered shank (F) is dominant over clean shank (f). If a hen's genotype is ff
and the rooster's genotype is Ff, what percentage of their offspring would have feathered shanks? Use the
Punnett square to help you find the answer.
A. 50%
C. 100%
B. 0%
D. 75%
17.
In minks, the gene for brown fur (B) is dominant over the gene for silver fur (b). Which cross would produce
offspring with silver fur from parents that both have brown fur?
A. BB × bb
B. Bb × Bb
C. Bb × bb
D. BB × Bb
18.
I want the probability that my child will have straight hair to be 100%. Straight hair is a recessive trait. If I have
straight hair, what will the genotype of my mate have to be?
A. hh
B. Hh
C. HH
D. hhh
19.
I have straight hair and my mate’s hair is curly. If we have a child and her hair is wavy, this is because the curly
hair gene is demonstrating
A. dominance
B. recessiveness
C. incomplete dominance
D. incomplete recessiveness
20.
Red flowers is a dominant trait (R) and white flowers is a recessive trait (r). If red
flowers demonstrate incomplete dominance, what percent of the offspring to the
right will be pink?
A. 0%
B. 25%
C. 75%
D. 50%
R
r
r
r
21.
A dog breeder and wants to show prospective buyers that his dogs are pure-bred. Which kind of model could he
use?
A. pie chart
B. line graph
C. dichotomous key
D. pedigree chart
Use the diagram below to answer the following questions:
22.
Which of the following statements about the diagram above is correct?
A.
Circles represent males
B.
Squares represent females
C.
Each level represents a new generation
D.
A circle and a square matched up means they are brother and sister
23.
What could the diagram be used for?
A.
to determine the probability that a trait is passed on
B.
to determine the probability that an offspring will acquire a certain trait
C.
to determine the pattern of inheritance of a particular trait
D.
to determine what color eyes someone has
24.
If the dark shaded shapes represent a genetic disease, what could be said about that genetic disease?
A.
only females inherited the genetic disease
B.
only males inherited the genetic disease
C.
the genetic disease skips generations
D.
the genetic disease affects all individuals in a family
25.
What percent of the offspring received the genetic disease in the 3rd generation?
A.
1/4 - 25%
B.
2/4 - 50%
C.
3/4 -75%
D.
2/8: 40%