Abstract
accepted belief in the existence of an evolutionary process, this is a far cry from a precise understanding of the mechanisms involved. Indeed, a number of theories about the mechanisms of evolution have emerged over the years, but none has been completely satisfactory. By defini tion, any theory of evolution is a theory of change. The essential question in its most basic form is, How does life get from state A to state B? A and B refer to anyone of the levels of biological organization which range from the amino acid sequence of simple polypeptides to the complex morphological, behavior al, and ecological characteristics of distinct species, to take two examples. Before the application of biochemical and molecl.lar techniques to evolu tionary questions that began in the mid-1960s (e.g. 52, 57), the apparent progression of biological
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