BIO 111 Lecture Notes - Lecture 20: Natural Selection, Macroevolution, Microevolution
Document Summary
Heritable change in 1 or more characteristics of a population from one generation to the next. Theory: existing species developed from pre-existing species. Things change over long periods of time (from geology) Biological species change over the course of many generations. Characteristics that will allow you to survive better in your environment. Transitional form- provides link between earlier and later forms. Isolated continents and island groups have evolved their own distinct plant and animal communities. Fundamental similarity die to descent from a common ancestor. Anatomical structures with no function but resemble structures of older ancestors. In embryonic stages we often have similar structures to past ancestors. All living species use dna, rna and proteins. Same type of gene often found in diverse organisms. Homologous genes 2 genes derived from same ancestral gene. Orthologs, happen in different species, still encode for the same proteins. Genes are not identical bc of independent accumulation of dif.
