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WorksheetsPunnett Squares
Total questions: 20
Worksheet time: 56mins
Name
Class
Date
1.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
2.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
3.
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
4.
G = green, g = yellow
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
5.
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%
6.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
7.
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%
8.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
9.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
10.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
11.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
12.
AA and Aa always show up as
a)
dominant
b)
recessive
13.
aa always shows up as
a)
dominant
b)
recessive
14.
Aa is
a)
homozygous
b)
heterozygous
15.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
16.
What is a punnett square?
a)
graph used to predict the possible genotypes of offspring in a given cross
b)
a graph used to predict the possible birth rate of offspring.
c)
a graph used to predict the possible behavioral characteristics an offspring could have
d)
None of the above
17.
In a punnet square where are the parent alleles written?
a)
Top and inside the boxes
b)
Only on the left and right side of the boxes.
c)
outside of the boxes (top and left side)
d)
All on the top side of the boxes
18.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
19.
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
20.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
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