KINE 200 Lecture Notes - Lecture 10: Ultraviolet, Genetic Variation, Pomelo
Document Summary
Genetic change in the population overtime: due to environmental factors, some alleles of genes become more common while other alleles become less common from one generation to the next. Appearance or disappearance of species: microevolution. 3 phases of evolution: first phase began 500-600 million years after earth was formed (or 4 billion years ago) First vapor in atmosphere cools and condenses to form water. Leads to cellular organisms called protocells which evolve into prokaryotic cells. About 1. 2 billion years ago eukaryotic cells evolve. Eukaryotic cells feature organelles that arise from prokaryotic cells consuming bacteria capable of speci c biological processes. Wednesday, november 15, 2017: third phase results in appearance of multicellular organisms. First occurs in oceans where water protects them from ultraviolet radiation of sun"s rays. Oxygen produced by photosynthesis produces ozone layer in atmosphere which provides protection from uv radiation allowing greater evolution of multicellular organisms and allows it to occur on land.
