Otangelo

Peto’s paradox – how intelligent design solves it Marc Tollis (2017): In a multicellular organism, cells must go through a cell cycle that includes growth and division. Every time a human cell divides, it must copy its six billion base pairs of DNA, and it inevitably makes some mistakes. These mistakes are called somatic mutations (cells in the body other than sperm and egg cells). Some somatic mutations may occur in genetic pathways that control cell proliferation, DNA repair, apoptosis, telomere erosion, and growth of new blood vessels, disrupting the normal checks on carcinogenesis. If every cell division carries a certain chance that a cancer-causing somatic mutation could occur, then the risk of developing cancer should be a function of Read More ›

Let’s suppose there was a first Last Universal Common Ancestor (LUCA) or a small population of it. How did it overcome deleterious harmful mutations, in order not to go extinct?   M.LYNCH (2003): Although uncertainties remain with respect to the form of the mutational-effect distribution, a great deal of evidence from several sources strongly suggests that the overall effects of mutations are to reduce fitness. Indirect evidence comes from asymmetrical responses to artificial selection on life history traits, suggesting that variance for these traits is maintained by downwardly skewed distributions of mutational effects. More direct evidence comes from spontaneous mutation accumulation (MA) experiments in Drosophila, Caenorhabditis elegans, wheat, yeast, Escherichia coli, and different mutation accumulation (MA) experiments in Arabidopsis. All of these experiments detected downward trends in mutation Read More ›