Aikakonetta ei tarvita, evoluutio on totta

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>Remnants of extinct monkeys are hiding inside you, along with those of lizards, jellyfish and other animals. Your DNA is built upon gene fragments from primal ancestors.

For some 20 years, scientists have used algorithms to compute their way hundreds of millions of years back into the evolutionary past. Starting with present-day gene sequences, they perform what's called ancestral sequence reconstruction (ASR) to determine past mutations and figure out the genes' primal forerunners.

But ASR algorithms have faced logical criticism. Species based on those primal genes are long extinct, and scientists can't travel back in time to observe mutations that have happened since. So, how can anyone find any physical benchmark to verify and gauge ASR?

Time travel substitute

A team of researchers led by Eric Gaucher, an associate professor at Georgia Tech's School of Biological Sciences, did it by building an evolutionary framework out of myriad mutations. Then they benchmarked ASR algorithms against it -- no time machine required.

Their results have shored up confidence that the widely used algorithms are working as they should.

"Most of them did a very good job -- 98% accurate," Gaucher said of contemporary algorithms' ability to compute ancient gene sequences. Their determination of proteins encoded by those sequences was virtually perfect.

By confirming the high accuracy of the algorithms, the Georgia Tech team has also corroborated the validity of current evolutionary science they're based on.

https://www.sciencedaily.com/releases/2016/09/160915090018.htm

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