BIOL 1010U Lecture Notes - Lecture 22: Siamese Cat, Pleiotropy, Human Height
Document Summary
Genetic and environmental basis of complex traits lecture. Textbook reference: chapter 18 in biology how life works (2nd ed. ) Complex traits: mendel studied single-gene traits: each one was determined by variation at a single gene and the traits are for the most not influenced by the environment. Discrete categories (green vs yellow: what are complex traits, complex traits are much more prevalent than single gene traits. More examples number of eggs laid by hens, milk production in dairy cows, Influenced by multiple genes as well as environment (ie. height; medium height is 4"5-4"7 not like this) yield per acre of grain. 1. high blood pressure: obesity, diabetes, depression (and heart disease, and cancer, quantitative traits vs. single-gene traits: Appear in one of two or more different phenotypes. Complex traits and environmental influence: expression of complex traits is susceptible to what factors, lifestyle choices and other environmental factors, examples: Inadequate nutrition is linked to slow growth.
