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molecular clock |
Also found in: Wikipedia | 0.06 sec. |
molecular clockUse of rates of mutation in genetic material to calculate the length of time elapsed since two related species diverged from each other during evolution. The method can be based on comparisons of the DNA or of widely occurring proteins, such as haemoglobin. Since mutations are thought to occur at a constant rate, the length of time that must have elapsed in order to produce the difference between two species can be estimated. This information can be compared with the evidence obtained from palaeontology to reconstruct evolutionary events. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The research addresses a long-standing debate among biologists: If the evolutionary clock were turned back and allowed to run again, would the pressures of natural selection steer an organism to the same outcome, or would chance mutations produce a different result? Kawasaki has, we believe, literally turned back the evolutionary clock with this pioneering technology," said Paul Abrams, M. Mitochondrial DNA alterations may not tick away like hands on a reasonably accurate evolutionary clock, Howell maintains. |
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Evolutionary clock
