Punnett Square Quiz
Name:______________________________________________ Period: ______________
Complete the following punnett squares and answer questions.
1. Complete the punnett square for a heterozygous A blood and homozygous B
blood cross. Give appropriate percentages and phenotypes for each type of
blood.
2. Attached earlobes is a recessive trait. Complete the cross between a man
with attached earlobes and a woman who has unattached earlobes, but who
is heterozygous for the trait. Please list the genotypes, phenotypes and
percentages for the trait.
3. A father is colorblind, which is a sex linked recessive trait, and his wife is not
colorblind, but is unsure if she is a carrier or not. Please complete all
possible punnett squares for their offspring. Hint: you should be completing 2
punnett squares.
Please list the percentages, genotypes, and phenotypes {in that order} after
completing punnett squares.