BICD 100 Lecture : BICD 100 Genetics.docx

• School: UCSD
• Department: Biol/Genetics,Cellular & Develop
• Course: BICD 100
• Professor: Keefe Reuther

Document Summary

All organisms from common ancestor: differences = structures of their genome. Evolution: a change in the genetic composition of a population over generations. Ex: 2 copies of every gene, 1 male and 1 female. These are two alleles (versions of a gene) Evolution happens when these numbers change: evolution involves a population: a group of potentially interacting, reproducing individuals. Origin of species (darwin: evolution as a fact. Mountain of evidence, such as common bone structures: natural selection drives adaptation. No mechanism for the creation of novel variation. Thomas morgan & mutation: worked w/ drosophila, previously thought mutations to be large, causing speciation or new morphological features, morgan quantified mutation, it"s mechanism, and its effect on body. Mechanism of inheritance: thought to be blending inheritance; equal blend of both parents, problem w/ blending inheritance: any beneficial adaptation will be diluted and eventually disappear (think of black dots on a screen example)