1. Types of Dominance Punnett Squares Cont. Pp 183-184, 244

2. Complete Dominance One allele is completely dominant over the other
the heterozygous phenotype is dominant in appearance

3. Incomplete Dominance
Dominant allele is unable to completely mask the recessive allele
the heterozygous phenotype is an intermediate (or blend) of the two
alleles
3 phenotypes and 3
genotypes

4. Codominance Both alleles are expressed
An individual that is heterozygous shows both traits at once
3 phenotypes and 3 genotypes N S NN NS N S NS SS

5. Sickle Cell Anemia

6. Codominance Sickle cell anemia N= normal RBC S = sickle RBC NN- normal
NS – has both types of
cells in blood
SS- has only sickle cells N S NN NS N S NS SS