1. Chi-Squared Test Mendelian Genetics

2. Purpose  A test used to determine if real data matches what the ratios a Punnett square predicts

3. Example Question  In a dihybrid inheritance problem, you have a chi- squared value of 10.25 with a degree of freedom (df) 3. Does this organism match the ratios predicted in the dihybrid cross?

4. Example Question  In a dihybrid inheritance problem, you have a chi- squared value of 1.3 with a degree of freedom (df) 3. Does this organism match the ratios predicted in the dihybrid cross?

6. Other Types of Inheritance

7. Pleiotropy  A single gene controls multiple, unrelated alleles  Example: Chicken with puffed feathers/also has trouble with internal body temperature

8. Multiple Alleles  More than two alleles possible for a single gene  Example: Blood type

9. Epistasis  Expression of one gene is controlled by the other  Example: Red hair gene and baldness

10. Polygenetic Inheritance  Many genes contribute to a variety of phenotypes  Example: Skin color, height