BIOL 2400 Study Guide - Midterm Guide: Natural Selection 2, Synapomorphy, Population Genetics
17 May 2020
School
Department
Course
Professor
Document Summary
Defintions: biological evolution: changes in the inherited traits of a population that occurs from one generation to the next. Three middle ear bones: pectoral fin of whales is homologous to forelimbs of other tetrapods, lineage that led to modern whales included freshwater semi-aquatic mammal that had legs but also had a involucrum. An involucraum is a thickened inner wall of the ectotympamic bone which protects the inner ear from increased pressure under water and is a synapomorphy of all cetaceans. This may have resulted from selection for communication during hunting as a result of living in groups. Principles of geology read by darwin illustrated that geological changes - small changes accumulate over long time. Essay on principle of population read by darwin population increases geometrically, and food sources increase arithmetically hence limited by resources. Showed that species are not fixed, and show variation. Adapt to environment and these are inherited by offspring"s eg giraffe + neck.
