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Punnett Practice

Total questions: 51

Worksheet time: 9hrs 30mins

Name
Class
Date
1.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
2.
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%
3.
In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?
a)
0%
b)
25%
c)
50%
d)
75%
4.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
5.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
6.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
7.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
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 
8.
A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color). 
a)
100 % tan
b)
100 % brown 
c)
50 % brown and 50% tan 
d)
75 % brown and 25 % tan 
9.

If a heterozygous parent and a homozygous recessive parent mate, what percentage of their offspring will be dominant?

a)

25%

b)

50%

c)

75%

d)

100%

10.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
11.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
12.
AA and Aa always show up as
a)
dominant
b)
recessive
13.
What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
14.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
15.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
16.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
17.
aa always shows up as
a)
dominant
b)
recessive
18.
Aa is
a)
homozygous
b)
heterozygous
19.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
20.
Which of the following is homozygous dominant?
a)
Yy
b)
Y
c)
yy
d)
YY
21.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
22.
Complex molecule that carries genetic information that defines an organism's traits. It is stored in the nucleus.
a)
DNA
b)
protein
c)
RNA
d)
glucose nucleic acid (GNA)
23.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
24.

Which of the following is a Homozygous Dominant Genotype?

a)

Yy

b)

XX

c)

zz

25.

Which of the following is a homozygous recessive genotype?

a)

HH

b)

dd

c)

Aa

26.

Which of the following is a heterozygous genotype?

a)

Gg

b)

UU

c)

pp

27.

In a Punnett Square, 1 box is equal to 25%. How much are 3 boxes equal to?

a)

25%

b)

50%

c)

75%

d)

100%

28.

Fill in the Yellow Box

a)

AA

b)

Aa

c)

aa

29.

Fill in the Yellow Box

a)

Bb

b)

BB

c)

bb

30.

How chance the offspring born from this cross will have a homozygous dominant genotype?

a)

25%

b)

50%

c)

75%

d)

100%

31.

The punnett square is used to tell the color of a frogs skin. "G" means green skin and "g" means brown skin. What is the chance the baby frogs will have brown skin?

a)

0%

b)

25%

c)

50%

d)

100%

32.

What is the mother's genotype?

a)

DD

b)

Dd

c)

dd

33.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
34.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both 
35.
G = green, g = yellow
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
36.
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%
37.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
38.
AA and Aa always show up as
a)
dominant
b)
recessive
39.
aa always shows up as
a)
dominant
b)
recessive
40.
Aa is
a)
homozygous
b)
heterozygous
41.
Genotype refers to the ...
a)
physical expression of the genes
b)
the possible combination of alleles in a gene
c)
whether an allele is dominant or recessive
d)
how an organism will appear
42.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
43.
What are the possible genotypes for this cross?
(Click the picture to see it without the text)
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
44.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
45.
What genotype would go in box 1?
a)
BB
b)
Bb
c)
bb
46.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
47.

What is the probability of heterozygous offspring?

a)

0%

b)

100%

c)

50%

d)

25%

48.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
49.

In a certain species of plant, the color purple (P) is dominant to the color white (p).

According to the Punnett Square, what is the probability of an offspring being purple?

a)

25%

b)

0%

c)

100%

d)

50%

50.

Which of these Punnett squares represents a cross between a homozygous dominant parent and a heterozygous parent?

a)
b)
c)
d)
51.

A dog with straight fur (Bb) is crossed with a dog with curly fur (bb). What is the probability the offspring will have straight fur?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

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