Further Research
Testable outlines exist for the origin of each of the three motility systems, and avenues for further research are clear; for prokaryotes, these avenues include the study of secretion systems in free-living, nonvirulent prokaryotes. In eukaryotes, the mechanisms of both mitosis and cilial construction, including the key role of the centriole, need to be much better understood. A detailed survey of the various nonmotile appendages found in eukaryotes is also necessary.
Finally, the study of the origin of all of these systems would benefit greatly from a resolution of the questions surrounding deep phylogeny, as to what are the most deeply branching organisms in each domain, and what are the interrelationships between the domains.
Read more about this topic: Evolution Of Flagella
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