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+
( + = antibodies against B type blood) A-
( - = no antibodies against B type blood) B
( + is dominant over - ) AB O

9. The Genetics of Blood Type
Phenotype
Genotype A+
( + will attack other blood types ) A- B+ B-
AB+
AB- O+ O-

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

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

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

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

14. 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--

15. The Genetics of Blood Type
Donor/Recipient?

16. The Genetics of Blood Type
How can we predict Blood Type inheritance?

17. The Genetics of Blood Type
How can we predict Blood Type inheritance?
Using a Punnett square!

18. 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-.

19. 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-.

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--

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

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

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