Incomplete Dominance and Codominant Traits

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Presentation transcript:

Incomplete Dominance and Codominant Traits

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

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

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.

Sickle Celled Hemoglobin vs. Regular Hemoglobin