The document provides information about human blood types: - There are 4 main blood types: A, B, AB, and O - The blood types are determined by the presence or absence of antigens (proteins) on the surface of red blood cells called A and B antigens - The genotypes that determine blood types are IA, IB, and i - Blood type A has the A antigen and genotype IAIA or IAi - Blood type B has the B antigen and genotype IBIB or IBi - Blood type AB has both A and B antigens and genotype IAIB - Blood type O has neither antigen and genotype ii Worked examples are provided to demonstrate inheritance of blood types through Punnett

1. Bell Work (pg 14)
• Solve the multiple allele problem that your
neighbor made up yesterday

2. Notes: Blood Types (pg 15)

3. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)

4. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)
Blood Type Surface Genotypes
Molecules
A
B
AB
O

5. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)
Blood Type Surface Genotypes
Molecules
A A IAIA Or IAi
B
AB
O

6. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)
Blood Type Surface Genotypes
Molecules
A A IAIA Or IAi
B B IBIB or IBi
AB
O

7. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)
Blood Type Surface Genotypes
Molecules
A A IAIA Or IAi
B B IBIB or IBi
AB Both A and B IA IB
O

8. Notes: Blood Types (pg 15)
• Humans have 4 blood types: A (IA), B (IB), AB
(IA IB), and O (i)
Blood Type Surface Genotypes
Molecules
A A IAIA Or IAi
B B IBIB or IBi
AB Both A and B IA IB
O None ii

9. Example
• Cross IAi with IA IB
IA i
IA
IB

10. Example
• Cross IAi with IA IB
IA i
IAIA IAi
IA
IB
IAIB IBi

11. Example
• Cross IAi with IA IB
IA i
IAIA IAi 50% Type A
IA 25% Type AB
25% Type B
IB
IAIB IBi

12. Practice Problem (pg 14)
• Mrs. Stewart has type B blood. Her mom has
type A and her dad type B.
A. What must her mom’s genotype be?
B. What are her dad’s two possible genotypes?
C. Draw both possible Punnett squares