WorksheetsPunnett Squares
Total questions: 20
Worksheet time: 32mins
Name
Class
Date
1.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
Short = S
b)
Tall = T
Short = t
Short = t
c)
Tall = t
Short = T
Short = T
d)
Tall = TT
Short = tt
Short = tt
2.
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%
3.
What are the possible combinations of a pea plant with the alleles PP and a male pea plant with the alleles pp.
P= purple
p= white
P= purple
p= white
a)
all Pp
b)
all PP
c)
Pp,PP,Pp,PP
d)
all pp
4.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
5.
Homozygous or heterozygous?
BB
BB
a)
Homozygous
b)
Heterozygous
6.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
7.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
8.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
9.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
10.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
11.
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
12.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
13.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
14.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
15.
Fill in the Yellow Box
a)
Bb
b)
BB
c)
bb
16.
Fill in the Yellow Box
a)
AA
b)
Aa
c)
aa
17.
How chance the offspring born from this cross will have a homozygous dominant genotype?
a)
25%
b)
50%
c)
75%
d)
100%
18.
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%
19.
What is the mother's genotype?
a)
DD
b)
Dd
c)
dd
20.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
both
100 %
