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wmw
Guest
Of course, genetic science is just too volatile to make any sort of predictions or comparisons between humans and sheep. That is exactly the point. The science is infantile and can’t be depended upon to be a basis for any conclusions of what happened at the dawn of mankind.
As further evidence that genetic science can’t be depended upon for such conclusions consider the huge failure to recognize large percentages of our DNA as functional claiming that it was just junk only 12 years ago:
As further evidence that genetic science can’t be depended upon for such conclusions consider the huge failure to recognize large percentages of our DNA as functional claiming that it was just junk only 12 years ago:
Human genetic information is composed of more than three billion base pairs of nucleotides, yet less than 2
percent of the DNA genetic material codes for protein production. Just a decade ago scientists referred to the
remaining genetic code as “junk DNA” because they long thought that it was purposeless evolutionary baggage.
Recent studies, however, have shown that this assumption was incorrect—a consequence of a preconceived
evolutionary mindset. Non-coding DNA appears to be functional and performs a number of important roles. An
October 2004 Scientific American article provided the following summary:
A perplexingly large portion of the DNA of complex organisms (eukaryotes) seems irrelevant to the
production of proteins. For years, molecular biologists have assumed this extra material was evolutionary
“junk.” New evidence suggests, however, that this junk DNA may encode RNA molecules that perform a
variety of regulatory functions.
The article concludes: “We may have totally misunderstood the nature of the genomic programming and the
basis of variations,” speculating that “the greater portion of the genomes in complex organisms is not junk at all…What was dismissed as junk because it was not understood may well turn out to hold the secrets to human
complexity…” This position, which in 2004 was mere speculation, is now a consensus.
In a related concept, the term “pseudogenes” refers to “nonfunctional sequences of genomic DNA originally
derived from functional genes.” In other words, pseudogenes are theorized to have begun as copies of
functional genes, but then underwent mutations that eventually rendered them non-functional. Scientists have
discovered, however, that a number of pseudogenes are functional. According to an article published in Nature in
May of 2003, “Our findings demonstrate a specific regulatory role of an expressed pseudogene, and point to the
functional significance of non-coding RNAs.” Another study in the 2003 Annual Review of Genetics found that
among other roles, “pseudogenes that have been suitably investigated often exhibit functional roles, such as gene
expression, gene regulation, generation of genetic (anti-body, antigenic, and other) diversity.”