New research from Dartmouth College
raises questions over how scientists should interpret observed groupings of
bacteria. The study advises caution with the assumption that bacterial clusters
are always a result of ecological and genetic forces.
The research indicates that random
diversification and extinction of cells could organize bacteria into taxonomic
units just as effectively as classification based on selection-driven
ecological forces. Scientists are currently divided over what factors to
consider when classifying bacteria and other microorganisms. Some favor the
so-called "periodic selection" model, in which the descendant of the
most-fit genotype takes over the population and establishes a new group. Others
advocate the "recombination" model, in which the frequent exchange of
material between genes within bacterial populations causes organisms to
cluster.
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Posted by Dr. Tim Sandle
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