Multiple alleles refers to inheritance patterns involving more than two alleles that determine a trait. The ABO blood group gene has three alleles that produce four blood types - A, B, AB, and O. Type O has no antigens and is the universal donor type. Type AB has both A and B antigens and is the universal recipient type. An individual's blood type is determined by the alleles they inherit from each parent.

1. Multiple Alleles
Prepared by:
Luby G. Canobas

2. Multiple Alleles
• is a type of non-Mendelian
inheritance pattern that involves
more than just the typical two alleles
that usually code for a certain
characteristic in a species.

3. • With multiple alleles, that means
there is more than two phenotypes
available depending on the
dominant or recessive alleles that are
available in the trait and the
dominance pattern the individual
alleles follow when combined
together.

4. • One such gene
which is of great
interest to humans is
the ABO blood group
gene. This particular
gene has three
alleles, rather than
two.

5. Genotype Phenotype
ii Type O
IAIA or IAi Type A
IBIB or IBi Type B
IAIB Type AB (codominant)

6. Do you know that????
• A universal recipient is a person with the AB
blood type. They can receive a blood
transfusion, or even a donated organ, from a
person with any blood type.
• Type O blood has no antigens, and is referred
to as universal donor blood, so that will not
cause a reaction.

7. Key Concepts
• In humans, there are four blood types
(phenotypes): A, B, AB, O
• Blood types is controlled by three alleles: A, B,
O.
• O is recessive, two alleles must be present for
a person to have type O blood.
• A and B are codominant. If a person receives
an A and B alleles, their blood type is type AB

8. Activity 3
Mother's Blood Type Father's Blood Type Child's Blood Type
A A
B AB
AB B
O O

9. Possible alleles from father
A B O
A
B
O
Possible
alleles
from
mother

10. Use the table to answer the following questions, and
lists all possible blood types
Q10. What Blood type/typess can be found
in an offspring if a mother has type A
blood and father has type B blood?
Q11. What blood type/types can be found
in an offspring if a mother has type AB
blood and father has type B blood?

11. Q12. What blood type/types can be found in an
offspring if a mother has type O blood and the
fathr has type B blood?

12. Thank You
Kingsoft Office
published by www.Kingsoftstore.com
@Kingsoft_Office
kingsoftstore