Do Now: What’s your type? Your blood type, that is! Do you know it? (You might want to

check your driver’s license if you don’t) If you do not know your blood type –

have you heard the word before? What does it mean?

BLOOD TYPES

Four Types A B AB O

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Antigens Antibodies Can accept blood from

Type A

Type B

Type AB

Type O

What makes up a type? Blood types are determined by the

antigens (proteins) on their surface Like nametags…

A type: A antigens B type: ___ antigens AB type: ____ antigens O type: _____ antigens

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Antigens Antibodies Can accept blood from

Type A A

Type B B

Type AB A, B

Type O ----

Protection Our bodies also make antibodies to help

fight off blood that ISN’T our type Body makes antibodies of antigens it

does NOT possess Example: Type A would make B antibodies Type B would make ____ antibodies? Type AB would make ____ antibodies? Type O would make ____ antibodies?

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Antigens Antibodies Can accept blood from

Type A A B

Type B B A

Type AB A, B ----

Type O ---- A, B

What happens if we mix…? Anything with antigens that you have

antibodies for will be destroyed

Knowing this… What precautions should we take with transfusions? A type can safely mix with ______? AB type can safely mix with ____?

Since AB doesn’t have antibodies, it can mix with anything!

Since O has A and B antibodies, it can only mix with O

Second Antigen: Rh Factor Only two types: Rh positive or negative UNLIKE A and B antigens, the body

doesn’t make antibodies for Rh automatically if it is negative If exposed once, it will make the antibodies If exposed again, the body will attack

Issue: Rh- woman giving birth to two Rh+ babies..

Baby Daddy Drama. A woman with blood type AB (IAIB) marries a man

with blood type O (ii). The child has blood type AB (IAIB). Is this man the child’s father?

Step One: Draw a punnett square and put the parents on each side

iAiBi

i

How to Tell… A woman with blood type AB (IAIB) marries a man

with blood type O (ii) The child has blood type AB (IAIB). Is this man the child’s father?

Step Two: Cross the Squares

iA i iB i

iA i iB i

iAiBi

i

How to Tell… A woman with blood type AB (IAIB) marries a man

with blood type O (ii). The child has blood type AB (IAIB). Is this man the child’s father?

Step Three: Decode the Punnett Square

iA IType A

iB IType B

iA i Type A

iB IType B

iAiBi

i

How to Tell… A woman with blood type AB (IAIB) marries a man

with blood type O (ii). The child has blood type AB (IAIB). Is this man the child’s father?

Step Four: Analyze! Could a type AB baby have come from the parents? (awkward)

iA IType A

iB IType B

iA i Type A

iB IType B

iAiBi

i

You Try A woman with blood type A or IAi marries a man

with blood type B or IBi. They child has blood type O or ii. Is this man the child’s father? Draw a Punnett Square to justify your response.