1. Blood Types
The Genetics of Blood Type

2. Codominance Both alleles are Dominant.
Neither allele for a trait is recessive.
They both express themselves in the phenotype.
Genotype labels are: I I
I = blood: A=type A coded protien
B=type B coded protien A B

3. The Genetics of Blood Type
Phenotype
Genotype

4. The Genetics of Blood Type
Phenotype
Genotype A

5. The Genetics of Blood Type
Phenotype
Genotype A B

6. The Genetics of Blood Type
Phenotype
Genotype A B AB

7. The Genetics of Blood Type
Phenotype
Genotype A
(I ) B AB O
(recessive)= i A B

8. The Genetics of Blood Type
Phenotype
Genotype A+ A- B
( + is dominant over - ) AB O
( + = Rh factor, protein on cell, Antigen.
Will be recognized by immune system
as part of body. )
( - = no Rh factor antigen. If body comes in
contact with +, it won’t recognize it as part of
the body and will reject it )

9. The Genetics of Blood Type
Donor/Recipient?

10. The Genetics of Blood Type
Phenotype
Genotype A+ A- B+ B-
AB+
AB- O+ O-
If Immune system doesn’t recognize a protein,
A or B, it’ll reject it.
A -Rh will not recognize +Rh and reject it.
Can receive: B+B-O+O- Will reject A+-AB+-
Can receive: B-O Will reject A+-B+AB+-O+
Can receive: ALL blood types
Can receive: All – types Will reject all + types
Can receive: O+O Will reject all others
Can receive: O Will reject all others

11. The Genetics of Blood Type
Phenotype
Genotype A+
AA++ A- B+ B-
AB+
AB- O+ O-

12. The Genetics of Blood Type
Phenotype
Genotype A+
AA++, AO++ A- B+ B-
AB+
AB- O+ O-

13. The Genetics of Blood Type
Phenotype
Genotype A+
AA++, AO++, AA+- A- B+ B-
AB+
AB- O+ O-

14. The Genetics of Blood Type
Phenotype
Genotype A+
AA++, AO++, AA+-, AO+- A- B+ B-
AB+
AB- O+ O-

15. The Genetics of Blood Type
Phenotype
Genotype A+
AA++, AO++, AA+-, AO+- A-
AA--, AO-- B+
BB++, BO++, BB+-, BO+- B-
BB--, BO--
AB+
AB++, AB+-
AB-
AB-- O+
OO++, OO+- O-
OO--

16. The Genetics of Blood Type
How can we predict Blood Type inheritance?
Using a Punnett square!
Let’s look at possible blood types of the children of a couple whose blood types are AB- and O-.

17. The Genetics of Blood Type
First we need to determine their genotypes.
Looking at our chart, the genotype for AB- is AB-- and the genotype for O- is OO--.
We need to FOIL and then draw a Punnett square.
From one parent we can get A- or B-
From the other we can only get O-.

18. The Genetics of Blood TypeA-
AO-- B-
BO--

19. The Genetics of Blood TypeA-
AO-- B-
BO--

20. The Genetics of Blood TypeA-
AO-- B-
BO--

21. The Genetics of Blood TypeA-
AO-- B-
BO--

22. The Genetics of Blood TypeA-
AO-- B-
BO--

23. The Genetics of Blood TypeA-
AO-- B-
BO--

24. The Genetics of Blood TypeA-
AO-- B-
BO--
Phenotype A- B-

25. The Genetics of Blood Type
Your homework:
Blood Types Worksheet