BIOLOGY 1M03 Lecture Notes - Phylogenetic Tree, Geologic Time Scale, Radiocarbon Dating
Document Summary
In the name of allah the gracious the merciful. Key concepts: populations and species evolve, which means that over time their heritable traits (height, weight, abilities) change over time. Typological thinking based on the idea that species are unchanging and variations in the species are irrelevant (old philosophers believed in this) Lamarack first to propose a formal theory of evolution. Darwin"s claim was that the variance among species in a population was the key for evolution because certain individuals with certain traits will produce more surviving offspring. Descent with modification used by darwin to describe evolution. Means that the species existing today all descent from preexisting ancestors, but certain traits have been modified through time. Pattern component makes 2 claims: species change through time, related by common ancestry. Many of darwin"s points make use of the fossil records. A fossil is any trace, or anything left behind (bones, branches, shells tracks) of an organism that lived in the past.