There is no dominant allele, There is no recessive allele. Both alleles “blend” to result in a third phenotype.

Traits that are Controlled by Three or More Alleles An Individual Has a Combination of Two of These

Allele A and Allele B are Codominant over Allele O (recessive) Blood Type Determined by the Proteins on the Surface of Red Blood Cells Type AProtein A Type BProtein B Type ABProteins A & B Type ONo Proteins

Key Red: Type A Blue: Type B Red/Blue: Type AB White: Type O What are the Genotypes of Each Individual?

Traits that are Controlled by Genes Found on the X Chromosome but not the Y Chormosome

Sex Linked Recessive Traits In Human Beings  Red Green Colorblindness  Hemophilia

Multiple Gene (Polygenic) Inheritance Gamet es AB C AB c Ab C Ab c aB C aB c ab C ab c ABC ABc AbC Abc aBC aBc abC abc Table 1. Polygenic inheritance in people showing a cross between two mulatto parents (AaBbCc x AaBbCc). The offspring contain seven different shades of skin color based on the number of capital letters in each genotype.