Could 2 People Actually Repopulate Earth
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Published 2021-12-22
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All Comments (21)
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If their children, instead of paring off, mated in a matrix, with each male reproducing with every female (and vise versa), after a few generations there would be huge matrix of combinations. There would, of course, be a lot of genetic problems, but there would also be a large number of viable offspring. If the problematic people didn't reproduce, there would eventually be large, genetically diverse and stable population.
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“carl accidentally killed Asher while fighting over toys” cain and abel flashbacks
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Elie, Aden, Carl, Asher, Sebastian all start with the same letters as Eve, Adam, Cain, Abel and Seth Nice detail
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This was a very informative "what if" scenario. I do wonder why you didn't take into account how hard pregnancy and birth can be on the body. Without doctors/nurses/midwives, what are the odds Ellie would've been able to survive having so many children?
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I've always wanted to know the answer to this question for at least 10 years. Excited to hear your response!
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As a practical matter, the answer is no. You need a minimum number of people to maintain enough genetic diversity to avoid long-term problems (something called "the founder effect" or a "genetic bottleneck" in Biology). I've read that that minimum number has been estimated at around 50,000 individuals. One of the reasons scientists are so worried about the cheetah population is that, not only are their numbers low, the species shows indications of exactly this sort of a troubling lack of genetic diversity.
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I'm reminded of the "Dark Eden" trilogy by Chris Beckett. The setting is a world populated by the descendants of two stranded astronauts - the technology level is essentially stone age, but a few artefacts of the original astronauts are still kept as holy relics, various genetic defects are rife ("batface"/cleft palate and "clawfoot"/club foot in particular), and an interesting culture has arisen.
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"Thankfully, they lived in Los Angeles, California" Don't need to watch the rest of the video to figure out the human race is doomed in Aiden and Ellie's hands.
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I remember hearing about a town in Italy, Stoccareddo, where almost everyone has the same last name, Bau, and most likely everyone is related. Almost everyone has red hair. They also eat extremely high fat foods and high sugar foods but have a very low occurrence of heart disease and diabetes. A majority of the population lives well into their 90s and 100s.
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Paradoxically, the answer to indreeding is redundant breeding. That was the case with small prehistoric isolated tribes. They knew no contraception, had many babies, and many of them died from inbreeding burth defects. But the ones who randomly had good genetic combination, survived.
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Ellie should've visited the nearest cryobank. Those robots can't have possibly targeted those before vanishing :)
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I love how that brief aside about one of the children murdering each other just plays out in 5 seconds and is quickly glossed over.
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As far as small gene pools are concerned, cheetahs are thought to be one of the smallest. DNA studies show that they may have about 70,000 years ago cheetahs been reduced to maybe as few as 4 animals. They are so genetically identical that all cheetahs are virtually brothers and sisters.
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So basically it'll depend on how genetically gifted the two last people on earth are? If both have an incredibly tiny portion of negative genetic mutations, there would be a higher probability of things working out. If both were genetically perfect (is this even possible?), Then I can imagine things working out with quite a high probability.
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Wow that was brilliant!! what a lot of research and graphics you have done - thank you.
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Didnt even realise 13 minutes had passed. Great cider man👍
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I can tell you of a bird that was reduced to just one female. The Chatams Islands Robin. In the late 1970's it became critical. By the time it was attempted to try to save the bird there were two females but then one died without offspring leaving just "Old Blue" and a handful (single figures) of males. But the old girl with help did it and produced offspring. Today there are maybe 300 birds all directly descended from "Old Blue".
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I've always wanted to know the answer to this question
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Ellie should just become a genetic scientist and check for the DNA of their offspring and those with "problematic" gene poles are paired together with those with more favorable gene poles. With this method she could breed out most of the problematic genes while endorsing the favorite ones.
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First the poor Ellie would have to survive childbirth / labor, hoping the guy who survived has good skills as a doctor and will not make her pregnant every year or she will die before she can make enough babies to worry about inbreeding.
