The document summarizes key information about human blood types: 1) Humans have 4 main blood types: A, B, AB, and O. 2) Blood types A and B are co-dominant traits, while O is recessive. 3) Type O blood is considered the universal donor as it can be donated to all other blood types, while Type AB is the universal recipient as it can receive donations from all other types.

1. Notes: Blood Types (pg 14)

2. Notes: Blood Types (pg 14)
• Humans have 4 blood types: A, B, AB, and O

3. Notes: Blood Types (pg 14)
• Humans have 4 blood types: A, B, AB, and O
• A and B are co-dominant. O is recessive

4. Notes: Blood Types (pg 14)
Blood Type Surface Genotypes
Molecules
A A AA or AO
B B BB or BO
AB Both A and B AB
O None OO

5. Example
• CrossAOwithAB
AO
A
B

6. Example
• CrossAOwithAB
AO
AA AO 50% Type A
A
25% Type AB
AB BO 25% Type B
B

7. Blood Transfusions
• Type O = Universal donor (can donate to all
other types)
• Type AB = Universal recipient (can receive
blood from all other types, but only donate to
other ABs)

8. Practice Problem (pg 15)
• 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