How quickly genomes change
December 31st, 2009 | 0 Comments
Evolution caught in the act: US-German team measures how quickly genomes change
Mutations are the raw material of evolution. Charles Darwin already recognized that evolution depends on heritable differences between individuals: those who are better adapted to the environment have better chances to pass on their genes to the next generation. A species can only evolve if the genome changes through new mutations, with the best new variants surviving the sieve of selection. Scientists at the Max Planck Institute for Developmental Biology in Tübingen, Germany, and Indiana University in Bloomington have now been able to measure for the first time directly the speed with which new mutations occur in plants. Their findings shed new light on a fundamental evolutionary process. They explain, for example, why resistance to herbicides can appear within just a few years. (Science, January 1, 2010)
Source: Max Planck Society – Press Release.
To those of us interested in human evolution and how it might still be occurring:
Turning to the larger picture, Weigel suggests that changes in the human genome are at least as rapid as in Arabidopsis: “If you apply our findings to humans, then each of us will have on the order of 60 new mutations that were not present in our parents.” With more than six billion people on our planet, this implies that on average each letter of the human genome is altered in dozens of fellow citizens. “Everything that is genetically possible is being tested in a very short period,” adds Lynch, emphasizing a very different view than perhaps the one we are all most familiar with: that evolution reveals itself only after thousands, if not millions of years.
Related posts:
- Fine-tuning and underwater monsters: score one for Behe A discussion between Michael Behe and a Christian evolutionist critical of ID, Keith Fox, took place on this week’s Unbelievable? It covered a lot of tired...
