Guy Threepwood
Mighty Pirate
That’s not correct. There only needs to be the increased probability of producing more offspring for each case that arises. If you magnify that probability to cover every creature of that species that has good mutation and then repeat it over millions of years, then that probability becomes quite high. It’s possible that millions of mutations never make a difference, because they don’t spread enough. But time and quantity solve it.
Also, a mutation will often spread a bit even without helping survival. Then you would have a group of creatures with a higher probability of survival. It’s all in the statistics. It’s entirely possible that many mutations spread without making an initial difference.
If you have a thousand birds with a particular mutated gene and a thousand which don’t, and the gene increases survival by 0.05%, then you’d expect a proportional increase in the population with that gene; 0.1% of 1000 = 5. Those 5 make a difference in the long term.
As above, well of course! if you grant that this tiny tiny advantage is somehow retained and spread to a extraordinarily successful 50% infiltration of the entire population first.. regardless of being insignificant - regardless of any natural selection of the gene whatsoever--??
then of course, those pennies would eventually add up- But with this human benefit of forethought removed, there's simply nothing in the algorithm that singles this insignificantly beneficial mutation out for such special treatment - over the overwhelming number of random mutations which remember, would be neutral to deleterious. - under this same 'saving all the mutation regardless' algorithm, the marginally inferior ones would be retained in far greater numbers and you have devolution.
i.e. survival of the fittest in no way demands survival of the fitter-
Even then, the other problem here is a catch 22 of gene pool stability- the large stable gene pools, over large periods of time, required to multiply your tiny tiny advantage into a few more offspring...are also the populations that most resist evolutionary change. Which is why we see species like Horseshoe crabs in stasis for 100's of millions of years with no evolution. Change requires pressure, stress, applied to a relatively small population- and this is even used as an 'explanation' for why intermediates are so hard to find.
As for the eye, you can have a more basic eye, starting with a single light-sensitive cell. Dawkins perfectly explains it all here.
https://www.youtube.com/watch?v=2X1iwLqM2t0
Well he says that you start with a single sheet of light sensitive cells before moving on to cups etc... - so you tell me, what advantage would I give a blind fish, by gluing a sheet of light sensitive cells to it's forehead?
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