Direction: Solve the problem below using the Punnett square and give both the genotypic and
phenotypic ratios. Use the PKPGP Method: (10 points)
• Brown (B) eyes are dominant over black. Find the possible offspring of a married couple with
heterozygous brown eyes.
Answers & Comments
Answer:
a.Parent: Brown eyes X Black eyes
b.Key:Male Bb X Female bb
c.Punnett Square
B b
b Bb bb
b Bb bb
d.Genotype: 2:Bb 2:bb
e.Phenotype: 2:Brown 2:Black
f.What are the genotypic ratio? 2:2
g.What are the phenotyphic ratio: 2:2