Punnett Square Review
Punnett Square Review
Punnett Square Review
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Name: _______________________<br />
Instructor: ___________________<br />
<strong>Punnett</strong> <strong>Square</strong> <strong>Review</strong><br />
Date: _______<br />
Period: ______<br />
Complete the <strong>Punnett</strong> <strong>Square</strong>s below and list the Genotype and<br />
Phenotype probabilities as fractions and percentages.<br />
Let’s work with Pea Plants like Mendel did. We will look at the possibilities of pod<br />
color. Green is the dominant pod color and yellow is the recessive pod color.<br />
Pick letters: [Green: G ] [Yellow: g ]<br />
Try these combinations…<br />
G G G G G G<br />
G G g<br />
G g g<br />
Genotypes<br />
? / 4 % Genotypes<br />
? / 4 % Genotypes<br />
? / 4 %<br />
Phenotypes Phenotype Phenotype<br />
G g G g g g<br />
G g g<br />
g g g<br />
Genotypes<br />
? / 4 % Genotypes<br />
? / 4 % Genotypes<br />
? / 4 %<br />
Phenotypes Phenotype Phenotype
Now try to do the same thing for right- or left-handedness. Righthandedness<br />
is dominant [R] and left-handedness is recessive [r].<br />
Genotypes<br />
? / 4 % Genotypes<br />
? / 4 % Genotypes<br />
? / 4 %<br />
Phenotypes Phenotype Phenotype<br />
Genotypes<br />
? / 4 % Genotypes<br />
? / 4 % Genotypes<br />
? / 4 %<br />
Phenotypes Phenotype Phenotype<br />
Mr. Jensen is left-handed but both of his parents are right-handed. Look at the <strong>Punnett</strong><br />
squares that you completed above and determine which one has two right-handed parents<br />
having left-handed offspring.<br />
1. What are the genotypes of Mr. Jensen’s parents?<br />
Mother’s Genotype:<br />
Father’s Genotype:<br />
2. Using the same <strong>Punnett</strong> <strong>Square</strong>, what is the probability of these parents having lefthanded<br />
offspring?<br />
%