PS 240.docx - September 9 2019 1PS 240 Is about-The many...

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September 9, 20191PS 240 Is about -The many influences on behavior -will be talking about humans, but it is not necessarily a course focused on human behavior -look to the natural world to find general principles of life - SexWhat is the biological basis of behaviour?The mechanisms of behavior Evolution is the basis of biology Mechanistic vs Functional Thinking “Explain a car to me”Mechanistic – explaining the parts of the car, how it looks, the mechanisms Functional’ “The function,” purpose, what it does, how it works etc.Mechanism FunctionEvolution Explain what evolution is. Darwin wasn’t the first scientist to discover the idea of evolution “Theory of Inheritance of Acquired Characteristics” – Jean Baptiste Pierre Antoine de Monet (not how evolution works)1831 Captain Robert Fitzroy -first time captain, very young -was accompanied by Darwin on a boat -The Beak of Finch
September 9, 2019-Birds specialize in the types of food, according to their beaks The process of evolution VariationThe biological world varies. No 2 individuals are alike When resources are limited, competition increasesWHO SURVIVES?The ones who can survive, can survive. The one with the traits that give you more of an advantage to escape from predators, find a mate, find limited resources ARE the ones that survive-a lot of competition within species-selecting out some selections through variation Inheritance -Is the one thing that helps with natural selection -Traits of the parents that are likely to be in the offspringAccording to Darwin, individuals don’t change overtime (proving Lamarckian wrong) but they inherit certain traits that either allow the individual to survive or they don’t -“blended inheritance” is questionable because then species would not evolve through natural selection. All species look at least somewhat similar. Traits from the parents pass down *Can’t have evolution without Inheritance*Theory of Evolution by Natural SelectionAlfred Russel Wallace Travelled and collected specimen and comes up with ideas and tells DarwinPrepares a joint paper for the Linnean Society Darwin release a book called “On the Origin of Species by Means of Natural Selection”T.H. Huxley: Darwin’s bulldogThe Great Debate1860 Meeting of the British Association Huxley & Samuel Wilberforce, Bishop of OxfordWilberforce: “was it through his grandfather or his grandmother that he claimed descent from the monkey
September 9, 2019Gregor Mendel-Interested with cross breeding plants-Pea plant --inheritance works through genetics Industrial Melanism Light moths survive longer than dark moths in certain areas due to their colour Genetic Variationis the thing we care about in Natural Selection-variation (for the most part) through random mutation-genes replicate and random process happen through mutation-mutations occur to create variations between genes-sometimes mutations can be beneficial (RARELY)Genetic variation explodes through sexual reproduction and gene flow

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