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No, it's showing that we maintain the extra artery. There is no reason to believe this is an evolutionary change - there are plenty of hormonal and other enviro

No, it's showing that we maintain the extra artery. There is no reason to believe this is an evolutionary change - there are plenty of hormonal and other environmental factors that could be contributing as well.

crazygringo 5y ago
Exactly -- if the rate of change is as high as they state -- from 10% to 30% of people in a little over a century -- it seems it would be essentially impossible for it to be the result of natural selection or genetic change. As you say, the obvious explanation is hormonal/environmental factors.
- gpsx 5y ago
  Yes - in order to have a change be that fast it would have to be something that makes those people dramatically better at surviving, like X-men type mutations, or reproducing. I don't think the change of this blood vessel is really turning the tables between survival and death, or making these people that much more successful at reproducing. But with the prevalence of online dating these days, maybe it is a big help by allow people to navigate faster? /s
  - Osiris 5y ago
    A mutation will also stick around if it doesn't prevent the person from reproducing. That can still be considered evolution even if it doesn't provide an obvious benefit.
    - nvrspyx 5y ago
      Just to clarify, the parent comment was stating that for a change (read: evolution) to be that _fast_, it would have to help either survivability or reproduction. In other words, increasing survivability or reproduction speeds up a mutation's proliferation throughout the species.
  - robocat 5y ago
    > makes those people dramatically better at surviving Better at reproducing. Death after reproduction has much less effect on evolution than death before reproduction. It is unfortunate that it is so often misstated (I am guessing you already know the difference, but I want to clarify it for those who are not so aware). As an aside, I think the article is complete and utter bollocks.
    - gpsx 5y ago
      I am guessing this is misstated because so often lack of survival is the reason there is less reproduction. But yes, it comes down to who passes their genetic material to the most offspring.
- enkid 5y ago
  What do you mean by environmental factors? The environment drives evolution, so changes in the environment would change who survives, which would lead to evolution. If it is an environmental factor that led to selection of individuals having this vein being more likely to propagate, that would still be evolution. This also some very simple scenarios that could lead to such a pressure, like the artery having some minor benefit in reproduction, but a disease we eradicated would disproportionately kill people with the artery.
  - deleted 5y ago
    [deleted]
  - OJFord 5y ago
    They mean within a lifespan factors, like pollution, diet, lifestyle, etc.
  - TrispusAttucks 5y ago
    Evolution is of a change in the genes. Environmental factors can influence the expression of a gene (think Testosterone or Estrogen) without a change of genetics. The change in expression over time and participant count the study highlights is not compatible with a natural selection driven evolution.
    - enkid 5y ago
      But this would still present an environmental pressure, which would drive evolutionary change. Maybe not this specific gene, but if the environment is driving changes to our anatomy, it will drive changes in to reproductive fit. Maybe not this specific artery, but some other anatomical change.
    - beerandt 5y ago
      Epigenetics is the missing term here.
evancox100 5y ago
Agreed, pretty clearly an epigenetic or environmental change, not an evolutionary DNA change.
edgyquant 5y ago
I mean, how is that not potentially evolution?
- idiotsecant 5y ago
  Because non-genetically derived influences are not evolution?
  - rixed 5y ago
    So what was Darwin writing about, one century before DNA was discovered, if not evolution?
    - MattPalmer1086 5y ago
      DNA is just a particular mechanism of inheritance. You don't need to know about DNA specifically to posit a theory of evolution (inheritance, variation, natural selection).
      - rixed 5y ago
        My point exactly.

crazygringo 5y ago

Exactly -- if the rate of change is as high as they state -- from 10% to 30% of people in a little over a century -- it seems it would be essentially impossible for it to be the result of natural selection or genetic change. As you say, the obvious explanation is hormonal/environmental factors.

gpsx 5y ago
Yes - in order to have a change be that fast it would have to be something that makes those people dramatically better at surviving, like X-men type mutations, or reproducing. I don't think the change of this blood vessel is really turning the tables between survival and death, or making these people that much more successful at reproducing. But with the prevalence of online dating these days, maybe it is a big help by allow people to navigate faster? /s
- Osiris 5y ago
  A mutation will also stick around if it doesn't prevent the person from reproducing. That can still be considered evolution even if it doesn't provide an obvious benefit.
  - nvrspyx 5y ago
    Just to clarify, the parent comment was stating that for a change (read: evolution) to be that _fast_, it would have to help either survivability or reproduction. In other words, increasing survivability or reproduction speeds up a mutation's proliferation throughout the species.
- robocat 5y ago
  > makes those people dramatically better at surviving Better at reproducing. Death after reproduction has much less effect on evolution than death before reproduction. It is unfortunate that it is so often misstated (I am guessing you already know the difference, but I want to clarify it for those who are not so aware). As an aside, I think the article is complete and utter bollocks.
  - gpsx 5y ago
    I am guessing this is misstated because so often lack of survival is the reason there is less reproduction. But yes, it comes down to who passes their genetic material to the most offspring.
enkid 5y ago
What do you mean by environmental factors? The environment drives evolution, so changes in the environment would change who survives, which would lead to evolution. If it is an environmental factor that led to selection of individuals having this vein being more likely to propagate, that would still be evolution. This also some very simple scenarios that could lead to such a pressure, like the artery having some minor benefit in reproduction, but a disease we eradicated would disproportionately kill people with the artery.
- deleted 5y ago
  [deleted]
- OJFord 5y ago
  They mean within a lifespan factors, like pollution, diet, lifestyle, etc.
- TrispusAttucks 5y ago
  Evolution is of a change in the genes. Environmental factors can influence the expression of a gene (think Testosterone or Estrogen) without a change of genetics. The change in expression over time and participant count the study highlights is not compatible with a natural selection driven evolution.
  - enkid 5y ago
    But this would still present an environmental pressure, which would drive evolutionary change. Maybe not this specific gene, but if the environment is driving changes to our anatomy, it will drive changes in to reproductive fit. Maybe not this specific artery, but some other anatomical change.
  - beerandt 5y ago
    Epigenetics is the missing term here.

evancox100 5y ago

Agreed, pretty clearly an epigenetic or environmental change, not an evolutionary DNA change.

edgyquant 5y ago

I mean, how is that not potentially evolution?

idiotsecant 5y ago
Because non-genetically derived influences are not evolution?
- rixed 5y ago
  So what was Darwin writing about, one century before DNA was discovered, if not evolution?
  - MattPalmer1086 5y ago
    DNA is just a particular mechanism of inheritance. You don't need to know about DNA specifically to posit a theory of evolution (inheritance, variation, natural selection).
    - rixed 5y ago
      My point exactly.