Complete Dominance Review - one allele exerts completely over the other. - in this situation you have one dominant allele and one recessive allele. In the presence of the dominant allele, the recessive is not visible. Example: Seed shape in peas – round is dominant (R), wrinkled is recessive (r) Possible Genotypes Possible Phenotypes RR – homozygous dominant Round Rr – heterozygous Round rr – homozygous recessive Wrinkled Example: What is the probability of two parents heterozygous for eye colour (brown is dominant, blue is recessive) to have a child that has blue eyes? Bb x Bb B b B BB Bb b Bb bb There is a 25% chance of having an offspring that has blue eyes.