EARTH 7 Lecture Notes - Lecture 4: Common Descent, Heritability
Document Summary
Earth 7: dinosaurs | lecture: evolution & the organization of life. Note taker: deanna coughlin (714) 235-7896; deannajasmine@yahoo. com lecture 4: History of humans is not the history of life: first seriously explored by buffon, popularized by hurron and. Many species have gone extinct: overwhelming evidence provided by cuvier in 1796. Common descent with modification and natural selection: darwin"s on the origin of species (1859) Species- a group of viably interbreeding organisms. Natural selection is one very important mechanism explaining evolution i. a. Darwin"s most important ideas: common descent with modification. All living organisms are relate, descending from a single common ancestor. Diversity is the result of the bifurcation of lineages (speciation) Similarity is the result of close ancestry: natural selection follows three observations (variation, selection, Inheritance: variation in a species, e. g. : sexual reproduction, changes in dna, differential survival and reproduction, often brutal in nature, heritability of variation, variation genetically controlled, offspring resemble parents aka exhibit similar variations i. b.
