Codominance in Humans
Blood types
Blood types
The
____________of our red
blood cells (RBCs) are covered
with a variety of proteins and
glycoproteins
Why? What is their purpose?
Blood types
One
of the major systems is the
ABO system
Discovered by Karl Landsteiner
in 1900 who then won the
Nobel Prize for his work in 1930
Blood types
 Four
blood groups:
covered in the “A” glycoprotein :blood
 RBC covered in the “B” glycoprotein :blood
 RBC covered in both the “A” and “B”:blood
 RBC not covered in either
:blood
 RBC
type
type
type
type
___
___
___
___
Genetics of blood types
 The
alleles for the “A” and “B”
glycoprotein are <dominant / recessive /
codominant / incompletely dominant>?
Glycoprotein
A: IA
Glycoprotein B: IB
Genetics of blood types
 The
allele for no glycoprotein is
<dominant / recessive / codominant
/ incompletely dominant>?

No glycoprotein: i
Genotypes of blood types
 Blood
type A:
 Blood
type B:
 Blood
type AB:
 Blood
type O:
?
Genetics of blood types
Do
now:
Page 196, #7-8
Blood types
The
question you are probably
asking is, “Who cares?”
What
does blood transfusions
have to do with blood types?
Blood types
People
can only receive a
transfusion of blood if:


Blood types
 People
with type A blood can get a
transfusion from:
Type
__ blood
Type __ blood
 People
with type B blood can get a
transfusion from:
Type
__ blood
Type __ blood
Blood types

People with type AB blood can get a transfusion
from:
Type
__ blood
Type __ blood
Type __ blood
Type __ blood

People with type O blood can get a transfusion
from:
Type
__ blood
Blood types
Universal Acceptor:
Universal
Donor: