1. Non-Mendelian Genetics

2. Incomplete Dominance
Incomplete dominance: occurs in cases in which one allele is not completely dominant over another.

3. Codominance Codominance: both alleles contribute to the phenotype.
Ex: Chickens
Either black, white, or speckled black and white.

4. Multiple Alleles Genes that have more than two alleles.
The individual can still only have two alleles.
Ex: coat color in rabbits.

5. Rabbit Furs cc
CC, Ccch, CCh, Cc
chc or chch
cchch, cchcch, or cchc

6. Polygenic Traits
Polygenic traits: traits controlled by two or more genes.
Ex. Skin color

7. Applying Mendel’s Principles
The common fruit fly: Drosophilia melanogaster.
Small, easy to keep in the laboratory, and produce large numbers of offspring in a short amount of time.
Mendel’s principles apply to all organisms.

8. Genetics and the Environment
Characteristics are determined by interaction between genes and the environment.