Complex Patterns of Inheritance
By: Emily Hess
Multiple Alleles
Multiple Alleles
Definition: Traits are controlled by more that two Alleles.
How will the trait appear?: There are more than two ways the traits can be expressed.
Human Blood type is an excellent example of multiple alleles.
There are 6 different genotypes, and 4 different phenotypes.
Allele Codes for
- IA Type "A" blood
- IB Type "B" blood
- i Type "O" blood
Genotypes Resulting Phenotypes
- IAIA Type A
- IAi Type A
- IBIB Type B
- IBi Type B
- IAIB Type AB
- ii Type O
As you can see, the lower case i is recessive, and A and B are co-dominate.