Types of Inheritances I Pp , 244

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Types of Inheritances I Pp 183-184, 244

Single gene traits Controlled by only one gene - complete, incomplete, and codominant EX. Huntington Disease (D/d), Sickle Cell Anemia (N/S) , Cystic Fibrosis (R/r)

Complete Dominance

Complete Dominance One allele is completely dominant over the other In the heterozygous phenotype the dominant masks the recessive

Incomplete Dominance

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

Sickle Cell Anemia

Codominance

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