Unformatted text preview: is Cope's rule which states that the body sizes of species in a lineage of organisms tend to get bigger through time. Horse evolution is a classic example. But what happens when you get bigger? In most cases body parts do not grow at the same rate, thus we have allometry . Allometric growth is the differential rates of growth of two measurable traits of an organism (often it is described as sizecorrelated changes in shape). It is quantified as y = bxa where x is the measure of one trait, b is a constant, a is the allometric coefficient and y is the other trait. In this form it describes a logarithmic relationship. It can be made into a linear relationship by taking the logs of the values measured for each trait (or by plotting on log x log graph paper):...
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 Fall '10
 GwenHauner
 Biology, Evolution, Logarithm, D'Arcy Thompson, general paleontological pattern

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