| A | B |
|---|
| Methods of Studying Human Genetics | Population sampling, pedigree studies |
| Population Sampling | A small number of individuals represent the whole population |
| Fraternal twins | nonidentical twins |
| Paternal twins | identical twins |
| Pedigree Studies | a family record showing how a trait is inherited over several gernerations |
| Codominant Trait | one trait does not totally mask the second; sickle cell disease |
| Multiple Alleles | Controlled by 3 or more alleles |
| Blood Types | A,B,AB,O |
| Polygenic | Traits that are controlled by several genes |
| Autosomes | all chromosomes except sex chromosomes |
| Sex-linked | Hemophilia/colorblindeness |
| XX | Female |
| XY | Male |
