Genome complexity: many different codes (Introduction)

by David Turell @, Thursday, June 14, 2018, 15:25 (178 days ago) @ David Turell

At least 31 are listed. The code bases are the same with differing meanings in different organisms. Stop codons differ. See the website to have a clear picture of the real bush of life and to understand that the so-called tree is not a tree at the genome level:

https://www.ncbi.nlm.nih.gov/Taxonomy/taxonomyhome.html/index.cgi?chapter=cgencodes

Here is a commentary:

Biologists have long thought that the genetic code is basically the same in all living organ isms-that is, genes “code for” the same protein in almost identical ways in almost all living things. As our SOS discussion illustrated, it is difficult to see how the codon-amino acid assignments could change without killing the host organism. That’s why evolutionary biologists have argued that the code we have today is the same as the code in the first living organism and why a universal genetic code points to a universal common ancestor. But is the genetic code universal? It turns out that it’s not. Since 1985 molecular biologists have discovered at least 18 different genetic codes in various species. Many of these are significantly different from the standard code. For example, the standard code has three different mRNA stop codons: UGA, UAA, and UAG . (A “stop codon” tells the cell to stop building-the protein is complete.) However, some variant codes have only one stop codon, UGA. The other “universal” stop codons now code for the amino acid glutamine. It’s very hard to see how an organism could have survived a transformation from the standard code to this one. Changing to this new code would cause the cell to produce useless strings of extra amino acids when it should have stopped protein production.”

Site: https://uncommondescent.com/evolution/there-are-now-many-variants-of-the-universal-gene...

My Comment: Does common descent exist? For an alternative code to work, design is required.


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