The cellular machinery that copies DNA during the standard process of cell division (outside DNA allele function outside reproduction) makes errors. Here, mutation can mean two wildly different things from heredity to literally an “error”. These errors have been found by John Hopkins to be likely the cause of more than 2/3 of all cancers in humans.
Scientists have measured this rate among humans and found it to be about 75 to 175 mutations per generation.”J. C. Sanford, Genetic Entropy and the Mystery of the Genome, 3rd ed. (Waterloo, NY: FMS Publications, 2008).
Using this known information about mutation rates, a research group led by Cornell University geneticist Dr. John Sanford modeled the accumulation of mutations in the human genome over generations using computer simulations that account for more real-life factors than any prior attempts. The algorithms incorporate the standard observations and theories behind population genetics.
They found that the buildup of mutations would eventually reach a critical level and become so severe that humans would go extinct.”Cornell University geneticist Dr. John Sanford
This process of genome degradation over time and successive generations is called genetic entropy. Remarkably, the time frame of human genome degradation coincides closely with a recent creation of six to ten thousand years ago as predicted by the documented genealogies found in the Bible.Tennessen, Evolution and Functional Impact of Rare Coding Variation from Deep Sequencing of Human Exomes, 64–69.