Unit 4: I Got it From My Momma
Puppy Probability
Name _______________________________________________
Date ________________ Period _______ Assignment 57
Puppy Probability!
Two dogs, Bandit and Buttercup, are going to have puppies. Their genotypes and phenotypes are shown in the table below.
BANDIT
BUTTERCUP
Genotype
Phenotype
Genotype
Phenotype
Bb
Black Spots
bb
No Spots
Ff
White Fur
ff
Brown Fur
ee
Blue Eyes
EE
Brown Eyes
1. What are the dominant and recessive phenotypes for each trait?
Trait
Dominant
Spots
Black spots (B)
Fur Color
Eye Color
2. What are the two possible genotypes for a dog that has black spots?
Recessive
No spots (b)
3. What are the three traits expressed by the phenotype for a dog with the genotype: EE, Bb, and ff?
4. Create a Punnett Square for spots and color the phenotype for each square.
What is the probability that a puppy will…
 Be homozygous dominant? ______ ÷ 4 = _______ %
 Be homozygous recessive? ______ ÷ 4 = _______ %
 Be heterozygous? ______ ÷ 4 = _______ %
 Have black spots? ______ ÷ 4 = _______ %
 Have no spots? ______ ÷ 4 = _______ %

5. Create a Punnett Square for fur color and color the phenotype for each square.
What is the probability that a puppy will…
 Be homozygous dominant? ______ ÷ 4 = _______ %
 Be homozygous recessive? ______ ÷ 4 = _______ %
 Be heterozygous? ______ ÷ 4 = _______ %
 Have white fur? ______ ÷ 4 = _______ %
 Have brown fur? ______ ÷ 4 = _______ %

6. Create a Punnett Square for eye color and color the phenotype for each square.
What is the probability that a puppy will…
 Be homozygous dominant? ______ ÷ 4 = _______ %
 Be homozygous recessive? ______ ÷ 4 = _______ %
 Be heterozygous? ______ ÷ 4 = _______ %
 Have brown eyes? ______ ÷ 4 = _______ %
 Have blue eyes? ______ ÷ 4 = _______ %

Unit 4: Genetics
_______________________________________________
Punnett Square Probability
_______ Assignment 51
Name
Date ________________ Period