Name_____________________ Period_____________________________
Punnett Square Worksheet
1.
With the human gene for eye color, Dark (C) is dominant and blue (c) is recessive. Create a punnett square for a mother that is
homozygous recessive for the trait and a father that is homozygous dominant for the trait.
A.
What are the genotypes of the parents?
B.
What are the phenotypes of the parents?
C.
List the phenotypes of the offspring.
D.
How many heterozygous and how many homozygous offspring do you have?
2.
For dimples, the presence of dimples (D) is dominant and the absence of dimples (d) is recessive. Create a punnett square for a
father that is heterozygous for the trait and a mother that is homozygous dominant for the trait.
E.
What are the genotypes of the parents?
F.
What are the phenotypes of the parents?
G.
List the phenotypes of the offspring.
H.
How many heterozygous and how many homozygous offspring do you have?
3.
I.
In ears, unattached earlobes (E) are dominant and attached earlobes (e) are recessive. Create a punnett square for parents that are
both heterozygotes for the trait.
What are the genotypes of the parents?
Name_____________________ Period_____________________________
J.
What are the phenotypes of the parents?
K.
List the phenotypes of the offspring.
L.
How many heterozygous and how many homozygous offspring do you have?
4.
The ability to roll one's tongue into a u shape, being able to (A) is dominant and Unable to (a) is recessive. Create a punnett
square for a father that is heterozygous for the trait and a mother that is homozygous recessive for the trait.
M.
What are the genotypes of the parents?
N.
What are the phenotypes of the parents?
O.
List the phenotypes of the offspring.
P.
How many heterozygous and how many homozygous offspring do you have?
5.
If dark hair (D) is dominant over blond hair (d). What would the offspring of a cross between two homozygous dominant
parents look like? What would their genotype be?
6.
If dark hair (D) is dominant over blond hair (d). What would the offspring of a cross between two homozygous recessive
parents look like? What would their genotype be?