AlexMBrennan wrote...
So as DNA can be decoded, why can't we see those biological markers?
Because there is like, a ton of data? How do you know that it's not encoded in the "junk DNA" that makes up 98% of the human genome?
Yet does this also indicate that ancestral memory is somehow written into DNA?
That seems unlikely, at least in the sense that you seem to be thinking of - mostly because DNA is static: Your DNA will look exactly the same in ten years time, so there is no way useful advice that you learn (e.g. Hide food, don't breath underwater, etc) could possibly be stored...
This is pretty much what I thought where our current understanding lay. It doesn't explain what instinct actually is or how it is passed along, though. Is this a genuine gap in our knowledge or am I missing something?
Br3ad wrote...
AlexMBrennan wrote...
Yet does this also indicate that ancestral memory is somehow written into DNA?
That seems unlikely, at least in the sense that you seem to be thinking of - mostly because DNA is static: Your DNA will look exactly the same in ten years time, so there is no way useful advice that you learn (e.g. Hide food, don't breath underwater, etc) could possibly be stored...
More or less, your DNA can actually leave markers to deal with certain situations, but it will be mostly the same. A village had a season of famine, and the decscendants of these peole had genetic markers to store more fat. This wasn't NS, mind you, it was simply that their grandparents experienced famine and their DNA adapted.
I remember seeing or reading this, how scientists were able to see how the human population was almost utterly destroyed after a super volcanic eruption or how they can see when the consumption of milk became common by looking at the causes of lactose intolerance.
However, things like irrational phobias are still strange. Many people in Great Britain are afraid of spiders or snakes. This I assume is a holdover from the days where such fears were justified because the creatures are deadly. There is no reason to fear them in this country - we have no poisonous ones.
So what carries that holdover ancestral fear? If these things aren't genetic, why do cats behave as they do, why does the dog get scared of the wolf he has never even experienced?