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Blood Types
3 Blood Alleles
A, B, & O
Dominant Blood Alleles
A&B
Recessive Blood Allele
O
Co-Dominance
Universal Donor
This is known as co-dominance because 2
alleles are expressed equally.
O blood type
Universal Recipient
AB blood type
Different Genotypes and Phenotypes:
Parent1
A
A
B
B
A
O
Example 1:
Parent2
A
O
B
O
B
O
Geno.
AA
AO
BB
BO
AB
O
Pheno.
A
A
B
B
AB
O
Jack is homozygous A and Jill is
heterozygous Type B, what are the possible
blood types for their children?
Jack=AA
Jill= BO
B
O
A
AB
AO
A
AB
AO
Possible Blood Types: AB or A
Another way you might see it:
IB
i
Example 2:
IA
IA IB
IA i
IA
IA IB
IA i
Jose is O blood type and Jane is
heterozygous B blood, their child is AB
blood, is Jose the father?
(show your work)