The Genes of Adam: genomic sweeps and hominin extinctions
Almost every hominin lineage has gone extinct. Neanderthal, Homo erectus, Homo rudolfensis, Homo habilis, Homo floresensis, Homo naledi, the australopithecines… -- they aren’t around anymore. There is just one exception – us. We are hominins, and we are still here, so far. But we had a close call sometime in the prehistoric past; genetic evidence shows that the population of modern humans was once very small. What was it that rescued us from extinction, so that we are now extremely numerous, populating almost every ecological niche on Planet Earth? Was it our own pluck and ingenuity? Or was it a fluke – a happenstance at just the right time (i.e., a miracle?) We’ll look at the “rescue package” that sets us apart from other primates, and perhaps from other hominins. We’ll consider how much we do or don’t resemble Neanderthal, and what their remains are telling us. We’ll examine evidence from Neanderthal and Denisovan genomes, including the ~60 genes that all modern humans have and no Neanderthals had, and ask why those genes swept so rapidly through the early modern human population. And we’ll think about how the physical evidence illuminates the way that God breathed his neshamah into a creature formed out of the earth, capable of fulfilling his command to “Be fruitful and increase in number; fill the earth and subdue it.”
Nelson M. Hoffman is retired after a career as a physicist at Los Alamos National Laboratory, working most recently in the Plasma Theory and Applications Group of the Computational Physics (XCP) Division. He earned a B.A. in Physics from Rice University in 1970, and a Ph.D. in astronomy from the University of Wisconsin in 1974. His research interests were mainly in the areas of laser fusion and plasma physics, transport in plasmas, gamma-ray diagnostics of fusion experiments, and statistical inference (“machine learning”) applied to data analysis. He has authored or co-authored more than 90 technical publications, which have garnered more than 3200 citations. He is a member of First United Methodist Church of Los Alamos, and is active in the Kairos Prison Ministry. He is a founding member and past president of the Los Alamos Faith & Science Forum (LAF&SF). Influenced by the writings on the history of science and culture by Toby Huff, Lawrence Principe, James Hannam, David Lindberg, Joseph Henrich, and many others, he believes it is highly likely that, without the crucial influence of Christianity in human cultural history, modern science would not even exist.