BIO 370 Lecture Notes - Lecture 2: Pesticide Resistance, Myoglobin, Mollusca
Document Summary
1/27 - lecture 2 history, scope, and evidence (ppt 1 continued) Fossils - represent groups of organisms where we can"t find any living descendents. Represent phyla (broad categorization of organisms with different body plans that have gone extinct) General pattern of progression for increase in families over time generally jagged - extinction events. E. o wilson - 5-10 million species (only 1. 5 million had been named) Large fraction of identified organisms - insects (>50%) Trilobites - count rig segments (characteristic and used to identify) Examples of persistent change, rapid change, and stasis no general pattern found across a stratigraphic section record. Evolution doesn"t have to be slow or progressive. 5 major events - 99% of species that have ever existed have gone extinct. Possible causes - impacts (comets, meteors, etc. ) Observed impacts - shoemaker-levy comet hit jupiter. Organisms change to adapt to their environment - darwin (birds of paradise) Natural selection - sexual selection, survival (i. e. camouflage)
