ABO Cross Example
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Cross of a heterozygous A and het b ind.
Let I represent the co-dominant A blood type allele
Let I represent the co-dominant B blood type allele
Let i represent the recessive O blood type allele
A blood
Type
B blood tupe
Offspring Genotypes
Offspring Genotypes
25%
25%
25%
25%
25% A and B Blood type
25% A Blood Type
25% B Blood type
25% O Blood Type
Identify Organisms of the Cross
Define Variables for the Alleles
Generate Gametes and complete the Punnet Square
Provide Genotype%
Provide Phenotype%
A
B
i
i
I
I
A
B
i
i
I
I
A
B
I
I
I
I
i
i
i
i
A
B
B
i
i
i
I
A
I
I
I
i
A
A
B
B