An examination of the theories for evolution of organisms and fossil support of phyletic gradualism and punctuated equilibrium.
Written in 2009; 1,524 words; 9 sources; MLA; $ 50.95
Paper Summary:
This paper discusses the two major theories for evolution of organisms and speciation: phyletic gradualism and punctuated equilibrium. It then discusses the fossil evidence that support both phyletic gradualism and punctuated equilibrium. The paper concludes that it would seem that the theory of punctuated equilibrium would seem more appropriate to explain what we observe as the results of macroevolution.
Table of Contents:
Introduction
Debate between Phyletic Gradualism and Punctuated Equilibrium
Fossil Evidence that support both Phyletic Gradualism and Punctuated Equilibrium
Opinion
From the Paper:
"A second example involves Melanopsis fossilis and Melanopsis vindobensis, melanopsis belongs to a species of freshwater mollusk. Several intermediates were found between the two. The presence of the intermediates gave rise to the question whether this was an example of gradualism. (Geary 1992) However, since gradualism theorizes that speciation takes place at the level of a population and not the individual, this notion was defeated because the parent, daughter and intermediates were all found in the same river beds, in the sediment. Researchers theorized that the intermediates were really hybrids between the parent and daughter species."
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