1. Incomplete Dominance
-While much of genetics deals with dominant and recessive traits where the offspring will resemble one of the parents, sometimes there can appear to be a blending of two alleles
-incomplete dominance is the existence of a third phenotype which is a blending of the parental traits
-a classic example of incomplete dominance is snapdragons; parents can be red or white whereas offspring can be pink

2. Incomplete Dominance
R = allele for red flowers W = allele for white flowers
red x white ---> pink RR x WW ---> 100% RW

3. Codominance
-Codominance is similar to incomplete dominance and works in the same way, but codominance means both alleles are fully expressed in the phenotype and appear together, whereas incomplete dominance is a blending of the parental traits
-classic examples of codominance include cattle with roan (or pinkish brown fur) and human blood types

4. Codominance
-There are four different blood types: A, B, AB, and O determined by three alleles
-all alleles will express themselves

5. Alternative Dominance
Questions:
1. A cross between a blue blahblah bird & a white blahblah bird produces offspring that are silver due to incomplete dominance. The color of blahblah birds is determined by just two alleles. a) What are the genotypes of the parent blahblah birds in the original cross? b) What is/are the genotype(s) of the silver offspring? c) What would be the phenotypic ratios of offspring produced by two silver blahblah birds?
2. A cross between a black cat & a tan cat produces a tabby pattern (black & tan fur together) through codominance. What percent of kittens would have tan fur if a tabby cat is crossed with a black cat?