1. Incomplete and Codominance

2. Simple Inheritance Mendel studied simple patterns of inheritance. Mendel studied simple patterns of inheritance. Found that inheritance was controlled by a dominant allele (B) or recessive allele (b). Found that inheritance was controlled by a dominant allele (B) or recessive allele (b). However, there are many inheritance patterns that are more complex. However, there are many inheritance patterns that are more complex. Most traits aren’t simply dominant or recessive. Most traits aren’t simply dominant or recessive.

3. “Incomplete Dominance” -When traits are inherited in an incomplete dominance pattern, the phenotype of the heterozygous is a blend of the homozygous dominant (BB) and the homozygous recessive (bb). Example: BB = red bb = white Bb = pink

5. Codominance -Occurs when both alleles for a gene are expressed in a heterozygous offspring. -Neither allele is dominant or recessive; no blending. Example- in horses, R is for red coat color, W is for white coat color. RW= roan coat color. RR = red, WW= white, RW= roan RR = red, WW= white, RW= roan