2012年2月18日星期六

An evolving theory - N.C. State University Technician Online

Published:?Monday, February 13, 2012

Updated:?Monday, February 13, 2012

Evolution, the scientific theory that random forces through time change the populations of living things, was a controversial topic 153 years ago, when Charles Darwin published his thoughts on evolution in On the Origin of the Species. Since his transformational voyage on the HMS Beagle, evolution and common ancestor theory have changed our modern understanding of nature dramatically.

Currently there is debate over the credibility of evolution, and as a student of science, I encourage us to embrace the doubt and skepticism, since that is fundamental to scientific thinking. However, let's not turn a blind eye to natural examples that have proven the theory of evolution.

Though we may feel very different from chimps, frogs or fungi, we share the same biomolecular structural components, similar metabolic pathways and even similar genes and proteins. None other than evolution can explain this, and thus far, no scientific argument has ruled it out.

If you look into the DNA of humans, we have a junk gene in the same sequence for our production of hemoglobin. If you look at the DNA of chimpanzees, they have that same dead gene. Neither serves a purpose. This gene, and on a larger scale our species, came from a common ancestor.

This information was not available when Darwin proposed his postulates. Though he wasn't right about everything, he established a foundation upon which our understanding of nature has grown, and as you will read from the following articles, it's only growing faster.

That said, happy belated Darwin Day.

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