Name:___________________________________________  Date: _________________

 

Practice with Punnett Squares I

 

1.      In pea plants, purple flowers are dominant to white flowers.

a.       Which trait is the dominant trait?

 

 

b.      Which trait is the recessive trait?

 

 

c.       What letter of the alphabet should you use? (Hint: first letter of the dominant trait)

 

d.      What would be the genotype of a homozygous purple plant?

 

e.       What would be the genotype of a white plant?

 

f.       Cross a homozygous purple plant with a white plant:

 

_______________________  X ______________________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

g.      What is the resulting phenotypic ratio?

 

 

h.      What is the resulting genotypic ratio?

 

 

2.      In pea plants, round seeds are dominant to wrinkled seeds.

a.       Which trait is the dominant trait?

 

b.      Which trait is the recessive trait?

 

c.       What letter of the alphabet should you use? (Hint: first letter of the dominant trait)

 

 

d.      What would be the genotype of a heterozygous plant?

 

e.       Does a heterozygous plant have round or wrinkled seeds?

 

 

f.       Cross a heterozygous plant with a another heterozygous plant:

 

_______________________  X ______________________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

g.      What is the resulting phenotypic ratio?

 

 

h.      What is the resulting genotypic ratio?

 

 

3.      In pea plants, green pea pods are dominant to yellow pea pods.

 

a.       Cross a heterozygous plant with a yellow plant:

 

_______________________  X ______________________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b.      What is the resulting phenotypic ratio?

 

 

c.       What is the resulting genotypic ratio?