BIOLOGY 172 Chapter Notes - Chapter 18.1, 18.4: Human Height, Personalized Medicine, Pleiotropy
Document Summary
Reading #26- 18. 1, 18. 4: complex traits and phenotype. Complex traits are important in plants and animals as well as humans. Many common human diseases are complex traits: phenotype is determined by measurement of, quantitative traits which are measured on a continuum with only small intervals between all possible phenotypes. Complex traits are affected by the environment: susceptible to lifestyle influences and other environmental factors such as low nutrition. Environmental risk factors are characterized in a person"s surroundings that increase the likelihood of developing a particular disease: affect the average phenotype for complex traits and variation in phenotype of these traits. Environment effects on complex traits in animals are evident in true breeding. Complex traits are affected by multiple genes: effects of individual genes are obscured by variation in phenotype that is due to multiple genes affecting trait and due to environment. Normal distribution is when the distribution of seed color phenotypes is approximated by a bell-shaped curve.
