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Blood Types
Genetics of Blood
Your blood type is established before you are
born, by specific genes inherited from your
parents.
Genotypes & Phenotypes
•There are 3 alleles or genes for blood type:
–A
–B
–O
Dominant & Recessive
• O is recessive
• A is dominant
• B is dominant
Genotypes & Phenotypes
•There are 3 alleles or genes for blood type:
–A
–B
–O
•So, what are the 6 possible genotypes?
Genotypes & Phenotypes
Genotypes & Phenotypes
Genotypes
Phenotypes
AA
Type A
AO
Type A
BB
Type B
BO
Type B
OO
Type O
AB
?
Co-dominant
When the dominant B allele
gets paired with the dominant
A allele…
AB
A new blood type results…AB
Genotypes & Phenotypes
Genotypes
Phenotypes
AA
Type A
AO
Type A
BB
Type B
BO
Type B
OO
Type O
AB
Type AB
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