Biology 1201A Chapter Notes -Georges-Louis Leclerc, Comte De Buffon, Heritability, Common Descent
24 Oct 2013
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An explanation of a set of natural phenomena, based upon proven or testable hypothesis and observation. Aristotle- the scala natura- that living thing are on a scale. Changes in fossil forms a result of repeated catastrophic events and new creations. Species evolve to better fit their environment. Through an organism"s lifetime, certain traits would be used and certain wouldn"t be. This causes a change in trait through reproduction. Natural agents currently at work have been at work throughout earth"s history. Species change gradually through time due to interactions between individuals traits and their environment. Differential survival and reproduction of individuals in a population due to current environmental influences. Heritability- proportion of phenotypic variation in a population due to variation in genes. Heritability= (variation due to genotype)/(total variation in phenotype) Fitness- is the degree to which an individual contributes offspring to future generations.
