1. Incomplete Dominance and Codominant Traits

2. Incomplete Dominance (think pink flower)
The heterozygous offspring genotype has a phenotype color that is in-between the parent’s color
There is no clear dominant trait
Ratio 1:2:1
“Mixture” or “intermediate” color of the parents

4. Codominance (think checkered-chicken)
2 dominant alleles are both expressed equally at the same time for the same trait

5. Sickle-Cell Anemia A Codominant Trait
High prevalence in African-Americans that are heterozygous for sickle cell
Sickle cell protects against malaria
Sickle-cell anemia means people make both regular hemoglobin and “sickled” hemoglobin
Sickled hemoglobin cannot carry oxygen very well.

6. Sickle Celled Hemoglobin vs. Regular Hemoglobin