1. Incomplete & Co-dominance

2. Incomplete Dominance Genotype is heterozygous (ex: Rr)
Phenotype is between two parents
Neither gene is completely dominant over the other
Ex: Red flower (RR) x White flower (rr) = Pink flowers (Rr)

3. Co-Dominance
In Co-dominance, both alleles contribute to the phenotype of the organism.
Genotype is heterozygous (ex: Bb)
Ex: Roan Cow - Shows 2 different colors.
Brown (BB) x White (bb) = Brown and White (Bb)

4. Multiple Alleles
Many genes have more than 2 alleles and are said to have multiple alleles.
Ex: Human Blood type – Controlled by 3 alleles – A,B,O
Possible blood types:
Type A – (AA, AO)
Type B – (BB, BO)
Type AB – (AB)
Type O – (OO)

5. Describe sex-linked alleles
Sex-linked alleles: controlled by genes located on sex chromosomes
Usually carried on X chromosome
Since females are XX, they are usually carriers of the trait
Since males are XY, they have a higher tendency for inheritance of trait

6. Pedigrees Pedigrees: graphic representation of a family tree
Symbols identify sex, if they are carriers, if they have a certain trait, etc.
Used to show how one trait has been passed along in a family

7. Pedigree Analysis
Pedigrees use symbols to illustrate inheritance