Co-dominance Traits
Christy Felder, Lexi Perardi, Lexi
Harris
The Problem:
• Mr. Perardi and Mrs. Felder are having
a baby. If Mr. Perardi had type O blood
and Mrs. Felder had type AB, what are
the possible phenotypes and genotypes
for baby Lexi?
Step 1:
• The first step is to figure out the
genotypes of the parents. Since Mr. P
has type O blood, his genotype is ii.
Mrs. F has type AB blood so her
genotype is I^A I^B.
Step 2:
• Make a punnett square for the possible
blood types.
i
i
I^A
I^Ai
I^Ai
I^B
I^Bi
I^Bi
Step 3:
• Write out the genotypes and
phenotypes for baby Lexi.
• Genotype-50% I^Ai, 50% I^Bi.
• Phenotype-50% Type A, 50% Type B
Soultion
• Baby Lexi has a 50% chance of having
type A blood (I^Ai) and a 50% chance of
having type B blood (I^Bi).
• YAY!!!!!!!! :)