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Unformatted text preview: General Biology II 12:07 July 11, 2011 Website rci.rutgers.edu/~uzwiak July 12, 2011 Evolution Nothing humans can do during their lifetime that can cause a change in genetic makeup Does not happen during an organisms lifetime Happens intergenerationally (not to an individual organism) Takes many generations to see change Humans are not evolving or surviving Possess traits to survive in current environment that allow for reproduction to continue to survive Societal expectations have no biological benefit at all Societal pressures do not correlate with natural instincts Society removes natural pressures Intergenerational Descending (Descendent Modification) Changes are selected by the environment Reproduction is so slow Once every 20 years or so is a generation Life = ancestral organism Adaptations (not of organ systems, etc) Traits that provide benefit > survive to reproduce > pass on trait to progidy/offspring > next generation survival increases Darwin Did not want any of his work or findings publicized/published His beliefs were so contradictory to social religious beliefs and he did not want to be ostracized by society Conceptualization of natural selection If life was perpetual then we wouldnt need to reproduce Tremendous fertility should = increase in population growth Population size stays relatively fixed despite capacity to reproduce Human population is growing exponentially Limited resources that are necessary for life Overproduction of individuals leads to the competition of resources and only a small number of individuals will survive as a consequence leading to a constant population size Even though we are at a homologous level (same number of digits, limbs, eyes, muscular components, etc) with genetic variability Individual characteristics within a population vary significantly (melanin, hair color, eye color, height, physical stature) All human with enough variation in characteristics There is variation but it is not a random event as a consequence of living but rather happens intergenerationally Variation is inherited (through genetics) and is not a response of somatic cells (non gamete cells) The survival of the organism depends on traits most suitable for environment Survival is not a random event but rather depends on inherited characteristics Eventual gradual change in characteristics of the population Overtime populations change as the traits that promoted survival are passed on and traits that did not support evolutionary advancement are selected against Natural Selection How it actually works...
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