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Punnett Square Review (All Types)

Total questions: 44

Worksheet time: 57mins

Name
Class
Date
1.

A condition in which both alleles for a gene are expressed so that both traits are visible is known as ---

a)

Codominance

b)

Incomplete dominance

2.

The blending of two traits is known as ---

a)

incomplete dominance

b)

codominance

3.

This type of inheritance pattern is a MIXTURE of two traits. This is known as ---

a)

incomplete dominance.

b)

codominance

4.

What type of inheritance pattern is shown here?

a)

Codominance

b)

Incomplete dominance

5.

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring will be calico (black and tan spotted)?

a)

25

b)

50

c)

75

d)

100

6.

Radish color is an example of incomplete dominant, red and white are pure breeding colors. While heterozygous are purple.


Cross a red radish with a white.

a)

4 purple

b)

1 red, 2 purple, 1 white

c)

2 red, 2 white

d)

1 red, 1 purple, 2 white

7.
How many alleles does an individual have for each trait?
a)
1
b)
2
c)
3
d)
4
8.

What type of inheritance pattern is shown here?

a)

incomplete dominance

b)

dominant

c)

recessive

d)

codominance

9.

The hair form gene shows incomplete dominance. Straight hair (SS) is dominant, curly hair (CC) is recessive, and wavy hair (SC) is heterozygous. Mr. and Mrs. Anderson both have wavy hair (SC). What percentage of their children will also have wavy hair (SC)?

a)

25%

b)

50%

c)

75%

d)

100%

10.

Codominance occurs in calico cats, which allows for the Black and Tan colors to show. What percentage of the offspring will be calico (black and tan spotted)?

a)

25

b)

50

c)

75

d)

100

11.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be black?

a)

25

b)

50

c)

75

d)

100

12.

Incomplete dominance occurs in cats, which allows them to be Black, White, or gray as shown on this Punnett square. What percentage of the offspring will be white?

a)

25

b)

50

c)

0

d)

100

13.

Mrs. Canal is type A and Mr. Canal is type O. They have three children named Greg, Rosalind and Biff. Greg is type 0, Rosalind is type A and Biff is type AB...

Can BIFF be there son? Explain

a)

Yes because he has a portion of A in his blood like his mom

b)

Yes because his dad is type O and that is a universal donor

c)

No because his sister is type A blood

d)

No because neither parent has the B allele

14.

Punnett Square Practice: Based on the information, which men COULD NOT be the father of the baby. Mom is type A and Baby is type B. Check ALL that APPLY. (create a punnett square if you need help figuring it out.)

a)

Sam - Type O

b)

Sebastian Type AB

c)

Sean - Type A

d)

Steve Type B

15.
A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
a)
4: Orange and White
b)
1: Orange : 1 White
c)
2 Orange: 2 Orange and White: 0 White
d)
1: Orange: 2 Orange and White: 1 White
16.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
17.
What are the blood types of the possible children that a woman (type O) and man (type AB) can have?
a)
O and AB
b)
O and A
c)
O and B
d)
A and B
18.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
19.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
20.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
21.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
22.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
23.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
24.
AA and Aa always show up as
a)
dominant
b)
recessive
25.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
26.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
27.

PHENOTYPE is

a)

the genetic make-up of an organism

b)

the physical trait of an organism

c)

nucleic acid

d)

Aa

28.

A-Brown hair; a-blond hair

Which describes is the phenotypes of the offspring?

a)

50 % Brown Hair and 50% Blond Hair

b)

25 % Brown Hair and 75% Blond Hair

c)

75 % Brown Hair and 25% Blond Hair

d)

0% Brown Hair and 100% Blond Hair

29.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
30.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
31.
If having hairy feet is a dominant trait what are the possible genotypes of a hairy foot person?
a)
HH or hh
b)
Hh or hh
c)
HH or Hh
32.

Mr. Krabbs is homozygous for his tall eyeballs, while his wife is heterozygous for her tall eyeballs. What is the chance that their children will have tall eyeballs?

a)

0%

b)

25%

c)

50%

d)

100%

33.

A punnett square has homozygous dominant and heterozygous offspring possibilities. What could be the genotypes of the parents?

a)

AA, aa

b)

Aa, Aa

c)

AA, Aa

d)

AA, AA

34.
Colorblindness is a sex-linked recessive disorder. A normal woman whose father was colorblind marries a man with normal color vision. What percentage of their sons will be colorblind?
a)
0%
b)
25%
c)
50%
d)
100%
35.
Hemophilia is a sex-linked recessive disorder. A woman with hemophilia marries an unaffected man whose father had hemophilia. What percentage of their daughters will have hemophilia?
a)
0%
b)
25%
c)
50%
d)
100%
36.
Colorblindness is a sex-linked recessive disorder. If the daughter of a couple is colorblind, what are the two possible genotypes of her mother?
a)
XAXA and XAXa
b)
XAXA and XaXa
c)
XAXa and XaXa
d)
Cannot be determined
37.
If a trait shows up more commonly in men than women it is probably
a)
not inherited
b)
on the x chromosome and dominant
c)
on the x chromosome and recessive
d)
on a normal body chromosome
38.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
d)
25%
39.
Which of the following is NOT a sex-linked trait?
a)
Color-blindness
b)
Muscular Dystrophy
c)
Huntington disease
d)
Hemophilia
40.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
41.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
42.
Colorblindness is a recessive x-linked disorder.
Which genotype represents a male with normal vision?
a)
XNXN
b)
XnXn
c)
XNY
d)
XnY
43.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
44.
Vitamin D resistant rickets (deformed bone formation) is a sex-linked DOMINANT trait.  According to the Punnett square, what percentage of female offspring will have the disorder?
a)
0%
b)
25%
c)
50%
d)
100%

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