BIO120H1 Lecture Notes - Lecture 11: Sexual Selection, Plant Cell, Multicellular Organism
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BIO120H1 Full Course Notes
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How and why did complexity evolve: e. g. Elephant looking at mouse: both multicellular organisms that evolved into more complex organisms. Lamarck"s view: all organisms have an inherent tendency to become more complex: organisms that are simple in nowadays haven"t had time to evolve into greater complexity, wrong thoery. Major transitions of evolution: greater complexity arises from greater cooperation amongst previously. Independent organisms: origin of cells, chromosomes, sexual reproduction, eukaryotes, multicellularity, colonies, lead to opportunity to greater complexity, they become one stuck unit, what they evolve is cooperation among previously independent organisms, e. g. What is the unit of selection: most phenotypic traits we study in organisms arose due to selection that increases the fitness of individuals: may or may not be good for the species, e. g. When is cooperation adaptive: gene that increases cooperation among relatives, it will be successful, high relatedness: genes that lead to helping relatives can spread via natural selection.
