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WorksheetsPunnett Squares
Total questions: 20
Worksheet time: 21mins
Name
Class
Date
1.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
2.
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
3.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
4.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
5.
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
6.
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
7.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
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
8.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
9.
Red flower (R) color is dominant to white flower (r) color in rose plants. What is the expected phenotypic results of a cross between two heterozygous (Rr) rose plants?
a)
100% red
b)
75% red, 25% white
c)
50% red, 50% white
d)
75% white, 25% red
10.
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 white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
11.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
12.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
13.
B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?
a)
BB x Bb
b)
BB x bb
c)
Bb x Bb
d)
Bb x bb
14.
What genotype would go in box 3?
a)
BB
b)
Bb
c)
bb
15.
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
16.
Two heterozygous red flower (white flowers are recessive) are crossed. What is the phenotype?
a)
75% red and 25% white
b)
25% red and 75% white
c)
100 White
d)
50% red 50% red
17.
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
18.
A green pea plant (GG) is being crossed with a green pea plant (Gg). What is the phenotype?
a)
100 % rainbow
b)
50% yellow and 50% green
c)
100% green
d)
100% yellow
19.
How many alleles are present in HHMmNn
a)
6
b)
4
c)
2
d)
12
20.
Two heterozygous parents produce offspring. What is the probability of the HOMOZYGOUS DOMINANT GENOTYPE appearing in the offspring generation?
a)
75%
b)
25%
c)
50%
d)
100%
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