PSYC 3458 Lecture Notes - Lecture 2: Genetic Diversity, Phenylketonuria, Trisomy
2 Feb 2017
School
Department
Course
Professor
Document Summary
Traits can be linked to speci c sex chromosomes (e. g. hemophilia, color blindness, etc. : mutations. Spontaneous changes within genes (either naturally or via environmental factors such as radiation, etc. : charles darwin (1809-1882) Ability for species to better meet the needs of their environment: variation. Every living organism is unique- focus on what makes us different rather than what makes us the same : selection. The organisms environment favors (or disfavors) certain variants over others (including physical environment, as well as conspeci cs and other species) Moving toward greatest adaption to environmental demands: retention. Necessary for evolution - selected variants must be retained through. Genetics: what happens if something goes wrong : genetic disorders/chromosomal aberration. Changes within one single gene (or small set) involving displacement or deletion of chromosomes, as well as changes in expression: different types of genetic disorders. Down"s syndrome (third copy of chromosome-21 > trisomy 21) Phenylketonuria: recessive gene- cannot properly break down proteins; causes brain damage.
