BIO 122 Lecture Notes - Lecture 1: Carl Woese, Louis Pasteur, Ribosomal Rna
15 Apr 2019
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Louis pasteur: cells arise from cells, they don"t arise by spontaneous actions. Descent with modification: characteristics of species can be modified from generation to generation. 2 conditions for natural selection in a population: Individuals must vary in characteristics that are heritable. Certain version of heritable traits help individuals reproduce more than other versions. Evolution occurs when heritable variation leads to differential succession in reproduction. Fitness: the ability of an individual to produce offspring. Adaptation: a trait that increases the fitness of an individual. Speciation: natural selection causes populations of 1 species to diverge to form new species. Tree of life: describes the genealogical relationships. Phylogeny: the actual genealogical relationships between species. Carl woese: started rrna- sequence of rrna will change over time- similar in closely related organisms. Charles darwin : species are unrelated, species are immutable. Aristotle: species into a linear chain based on inc size and complexity. Lamarck: evolution is progressive- always producing better.
