Pedigrees

Wellllll today, we learned about pedigrees. Though most people seemed to find them easier to understand than Punnett Squares, I'm not quite sure I'm on the same page.  Pedigrees look like family trees, except for they focus on all the genetics aspects of a family.   Different symbols are used to represent gender and whether or not someone carries a disease, has a disease, or is not a carrier at all.

Here's an example of a very simple pedigree, with the blue, colored-in shapes representing someone that has the disease: