An oft-repeated claim by skeptics is that geneticists have disproved the possibility of Adam and Eve. Because existing human genetic diversity is so great, there can be no original couple from whom all people are descended.
Or, thats what were told.
Biology professor and author Dennis Venema summarizes this argument in his book, Adam and the Genome. In it, he claims that every genetic analysis estimating ancestral population sizes has agreed that we descend from a population of thousands, not a single ancestral couple.
Some Christian authors have reacted to this apparent consensus by proposing new ways of reading Genesis that make Adam and Eve either mythological or not really our first parents. The goal has been to accommodate theology and the Bible to what were told is settled science.
But what if the science on Adam and Eve isnt so settled? Thats the argument of a new paper by Discovery Institute senior fellow and developmental biologist Ann Gauger and Swedish mathematician Ola Hssjer, recently published in the journal, BIO-Complexity.
In order to test whether it really is impossible to account for modern variation in human beings by starting with just two people, these researchers did something that, incredibly, no one had tried before: They started with just two people, and ran the numbers.
Using accepted population growth and mutation rates, Gauger and Hssjer programmed a computer to start with a genetic Adam and Eve and replicate the known distribution of diversity in todays human population. Their results, to put it simply, fly in the face of the much-touted consensus.
According to their model, a couple who shared some genetic markers could generate all the diversity we see today within about 2 million yearswhich Venema and others claim is impossible.
However, given two people who share no genetic markersin other words, two people who werent born but were created with four unique sets of chromosomesthat time frame drops to a few hundred thousand, not millions, of years.
Writing at Evolution News, Gauger points out that further tweaks in the rates of population growth, structure, mortality, birth, and mutation could place that theoretical first couple even more recently in history.
In any case, the authors are careful to note that the point of their paper was not to date Adam and Eve, or even to prove from a genetic standpoint that they existed. Rather, they just wanted to demonstratecontrary to the oft-repeated claimthat it is possible for all human beings to have descended from an original pair.
Of course, much more work remains to be done, but the paper has served to clarify two things.
First, scientists assumptions about the past can change their results. Gauger explains that once hurdles in computing power were overcome, this experiment was an obvious way to test existing dogma on human origins. But in her words, no one bothered because They believed that starting from two was useless.
In fact, many researchers failed to use standard methods for modeling population genetics because of their baked-in evolutionary assumptions. For instance, one popular tool relies on comparisons between human and chimpanzee DNA to track mutationssomething Gauger points out is useless if we dont share a common ancestor with chimps.
Second, and more importantly, this paper hints at how tentative so-called settled science can be. Christians who rush to revise their understanding of characters like Adam and Eve to make way for the latest consensus should think more about the theological consensus theyre tinkering with, like the fall, the image of God, original sin, and creation.
They should also consider all the un-tinkering they may have to do one day when that scientific consensus changes.
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BreakPointis a program of the Colson Center for Christian Worldview. BreakPoint commentaries offer incisive content people can't find anywhere else; content that cuts through the fog of relativism and the news cycle with truth and compassion. Founded by Chuck Colson (1931 2012) in 1991 as a daily radio broadcast, BreakPoint provides a Christian perspective on today's news and trends. Today, you can get it in written and a variety of audio formats: on the web, the radio, or your favorite podcast app on the go.
John Stonestreetis President of the Colson Center for Christian Worldview, and radio host ofBreakPoint,a daily national radio program providing thought-provoking commentaries on current events and life issues from a biblical worldview. John holds degrees from Trinity Evangelical Divinity School (IL) and Bryan College (TN),and is the co-author ofMaking Sense of Your World: A Biblical Worldview.
Publication date:November 18, 2019
Photo courtesy:Getty Images/Digital Imagination
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