WorksheetsPunnett Squares
Total questions: 20
Worksheet time: 30mins
Name
Class
Date
1.
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
2.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
3.
What is the probability of heterozygous offspring?
a)
25%
b)
50%
c)
0%
d)
100%
4.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
5.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
6.
Which choice best represents the genotype of this cross?
a)
1 Yy: 2 yy: 0 YY
b)
2 Yy: 2 yy: 0 YY
c)
3 Yy: 1 yy: 0 YY
d)
1 Yy: 3 yy: 0 YY
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.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
9.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
10.
Which of the following is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
11.
Which of the following is an example of phenotype?
a)
bb
b)
blue eyes
12.
Which of the following genotypes are purebred?
a)
Pf
b)
Pp
c)
PP
d)
pP
13.
If you are purebred dominant for a trait, your genotype would be...
a)
Tt
b)
TT
c)
tt
d)
tall
14.
Which of these is homozygous recessive?
a)
Rr
b)
rR
c)
RR
d)
rr
15.
This trait is hidden whenever the dominant allele is present
a)
dominant allele
b)
codominance
c)
recessive allele
d)
Punnett Square
16.
This trait always shows up in an organism when the allele is present
a)
dominant allele
b)
codominance
c)
probability
d)
recessive allele
17.
A chart that shows all the possible combinations of alleles that can result from a genetic cross
a)
dominant allele
b)
codominance
c)
probability
d)
Punnett Square
18.
An organism's physical appearance or visible traits. (what it looks like)
a)
phenotype
b)
genotype
19.
An organism's genetic makeup, or allele combination. The letters we use to show the allele combination.
a)
phenotype
b)
genotype
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%
100 %
