1. Types of Inheritances Pp 237, 242-245

2. 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)

3. Multiple allele trait Controlled by more than two alleles in one gene Trait controlled by multiple alleles, with two that are codominant and one “null” I A : produces A antigens on surface of cell I B : produces B antigens i: does not produce antigens

4. Still only inherit one copy from each parent for a total of two alleles but have a few to combine EX. Blood type: I A I A, I A i, I B I B, I B i, I A I B, ii

5. Polygenic traits controlled by additive effects of two or more genes so each gene is responsible for adding pigment EX. Skin color (controlled by 3-6 genes), eye color

6. Sex linked traits Gender determined by XX or XY Disorder/trait found on the “X” chromosome seen more in men than women EX. (color blindness and hemophilia) “Y” has to come from father “X R or X r ” vs just “R or r”

7. Possible genotypes and phenotypes: X R X R = normal vision X R X r = normal vision X r X r = color blind X R Y = normal vision X r Y = color blind X R X r X R Y XRXrXRXrXRXrXRXr XRXRXRXRXRXRXRXR XrYXrYXrYXrY XRYXRYXRYXRY

8. Sex-influenced trait Usually autosomal Specific hormones influence trait/genotype EX. Baldness: testosterone influences BB