A, B, O B
more than two alleles control a trait
A, B, O System
Alleles are either A, B, or O
Blood types can be A,
B, AB, or O
Example – Human
Blood type is determined by the type of antigen present on the surface of the red blood cell
Antigens – stimulates an immune response when a foreign substance enters the body
Antigens produce antibodies
Antibodies are like
“soldiers,” they destroy foreign substances
Which blood type(s) can A, B, AB, and O receive?
Which blood type(s) can A, B, AB, and O donate to?
Can get blood from…
A, B, AB, O
Can donate to…
A, B, AB, O
Rh is an antigen that is sometimes present on the surface of red blood cells
85% of the United States population is Rh positive
This means that they carry the Rh antigen
People who do not have the Rh antigen are called Rh
Called the Rh factor
Named after the rhesus monkey in which it was first discovered
Rh+ is dominant over Rh-
People who are Rh- CANNOT receive blood from a person who is Rh+!
If an Rh- person receives a transfusion that is Rh+
the Rh- person will make antibodies against the Rh+ blood
The antibodies will react with the antigens of the Rh+ blood and the two blood types will clump
This clumping is called AGGLUTINATION
If mom is Rh- and dad is
Rh+ = baby will be Rh+
During delivery baby’s blood may get into mom’s bloodstream and she will make antibodies against the Rh+ blood
If she gets pregnant again her antibodies against Rh+ blood can cross her placenta and attack baby
#2 Rh+ blood
If one parent has type O blood and the other parent has type AB, what are the possible blood types the offspring could have?
A O A O
B O B O
If both parents are rH+ , is it possible to have a child that is rH- ???
If both parents are type AB, what are the possible blood types of the offspring?
If one parent is type A and the other parent is type AB, what is the chance of having a child with AB?
If one parent is type A and the other parent is type B is it possible for them to have an AB child?
If one parent is A and the other parent is B, is it possible for them to have a child with type O?
If one parent is type A and rH+ and the other parent is B and rH+ is it possible to have a child that is type AB and rh- ? Hint, do your Punnett squares separately!
If one parent is type AB and rH+ and the other parent is AB and rH+, what is the chance of having a child that is type B and rH-?
Hint, both parents are heterozygous for rH factor.