Video Creator’s Channel Chris Williamson

• menopause
• genetic
• lifespan
• evolution
• cetacean

Why Is It That Human Females Go Through

menopause because I don’t think that many other animals or most other animals do hardly any hardly any of those I heard of one one cetacean Some. In other words, some sort of a dolphin goes through menopause that’s the only other species I’ve ever heard of the the theory is that at some point a woman reaches a an age that humans over time began to become more and more long-lived and at a certain age. It’s more dan if a woman. If we live in social groups, we take care of the members of our group, and if the mother is taking care of her children and then her grandchildren her bearing another child. There’s the danger she’ll die in childbirth or that she’ll die when that child is young and so it actually it’s a an economic sense that.

Genes Making An Economic Like You Know

like Dawkins talked about in the selfish gene. It isn’t like that our genes actually make decisions, but we can think of them as saying Click now let’s switch to this strategy where I it’s better off me being a grandmother than dying in childbirth or dying while I have a very young child and so better to just invest. I think the reason that it’s sort of unique to humans comes from because of our brains Pregnancy is particularly dangerous for moms right like labor labor is dangerous um and also we just need a lot of like or we benefit a lot from long-term social support more so than most other animals. So back we’ve talked about this. I think Dave but Kim Hill also did some data where they actually you know Kim Hill and Hillary Hillard Kaplan a.

Of People Have Have Analyzed Things Like The

calories that are brought in by people over their lifespan. In these kind of horticultural, you know groups living sort of close to the ancestral circumstances living in the jungles of South America, and they one of the things that they tell me is that first of all the average couple doesn’t really bring in enough calories to care for themselves and their children. They’re so busy taking care of the kid. They can’t bring enough calories and so they need their relatives to help them out and their neighbors to help them out and the average male doesn’t bring in enough calories until he’s like 20 years old to really to be a guaranteed source of protein and so because we’re so incredibly dependent in ways that most other animals were so incredibly dependent on that risk pool group that you. know that that’s what makes us the special species in which it pays for the female to to stop reproducing because she’s still in this group.

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Shes Still Caring For Shes Still Sharing

calories and time and resources on the on her. You know second generation offspring, but she’s no longer continuing to produce more mouths that need feeding right exactly right and and she’s yeah and she’s no longer she’s not taking the risk because if a woman has a kid three years before menopause right and she would have died three years later that that young three-year-old is going to be essentially helpless right so right so those younger kids, especially the more recent the kid was born compared to menopause if if there was a risk of death. The better right does this mean that menopause would have only emerged after a time when human females were. to be on average older than 40 years old or 45 years old, or something like that would have to but there would have to have been selection pressure operating at that age for it to because it’s a universal feature of humans, So there would have had to have been some selection pressure. I guess one other theory is there could have been a weird bottleneck where there was only a small number of human beings and there was a genetic switch and one of the females that the only one that survived that’d be the other possible theory and it was an accident Ah, Oh that is cool, but I guess that that could potentially explain a whole bunch of phenomenon that we can’t really come up with an explanation for that there’s adaptive explanations that are sometimes contested wasn’t there it was it was a period that.

We Got To Where There Was Less

than 10 000 Homo sapiens on the planet right and everybody was in Indonesia or something? I don’t know that but that that that’s interesting if that were true. It would have led to a lot of bottlenecking and some. We might have some unique characteristics that we don’t really have to have. I I mean it’s also possible I don’t I don’t know the like anthropological literature on this but it’s possible that they say it was a mutation that worked in a small group and then it just sort of lived among humans until we got to the point where by and large women tend to live past 40. Then it suddenly becomes incredibly advantageous and then that’s when it spreads right yes that’s that’s when it sort of becomes that’s a good point that’s the way it works if it.

Had A Cost You Know Then

it would have been selected out at some point, but if it actually had an advantage, you know that advantage could have could have been magnified. It’s like a latent benefit almost that sort of sat idling away and then becomes significantly more beneficial at some point and it it’s the um the fortunate timing of both of those things coming together that you have the genetic mutation. Perhaps at a time when there’s an explosion of that genetic mutation being advantageous. But I suppose that’s what all mutations are that’s the name of the game random variation and selective retention that is evolution what’s happening people If you enjoyed that then press here for the full unedited episode and don’t forget to subscribe peace you.

Summary

The theory is that at some point a woman reaches a an age that humans over time began to become more and more long-lived and at a certain age . Pregnancy is particularly dangerous for moms right like labor labor is dangerous um and also we just need a lot of like or we benefit a lot from long-term social support more so than most other animals . Some of a dolphin goes through menopause that’s the only other species I’ve ever heard of the the theory is the theory . Some people have analyzed things like the calories that are brought in by people over their lifespan, and they tell me that the average couple doesn’t really bring in enough calories to care for themselves and their children . We can think of them as saying Click now let’s switch to this strategy where I it’s better off me being a grandmother than dying in childbirth or dying while I have a very young child and so better to just invest. It isn’t like that our genes actually make decisions,…. Click here to read more and watch the full video