P Generation
mate 2 of these
RrYy
x
RrYy
Pedigrees
What was unusual about the 2 pedigrees you studied?
examples:
colorblindness
hemophilia
DMD
genes for these traits are typically located
on the X chromosome; males more affected
“blending” of alleles - neither one dominates
examples: flowers called snapdragons
Codominance
“sharing” of alleles - both dominate
example: black chicken x white chicken = checkered chicken
Multiple Alleles
more than 2 alleles exist for a given trait
example: Blood Typing
Polygenic
more than 2 genes control a given trait
example: eye color, skin color, height