Charlie P. (NY)
Gold Member
- Feb 3, 2006
- 13,017
- 17,162
- Detector(s) used
- Minelab Musketeer Advantage Pro w/8" & 10" DD coils/Fisher F75se(Upgraded to LTD2) w/11" DD, 6.5" concentric & 9.5" NEL Sharpshooter DD coils/Sunray FX-1 Probe & F-Point/Black Widows/Rattler headphone
- Primary Interest:
- Metal Detecting
"How long is 200,000 in the scale of evolution?"
Depends on the mechanism of change: Natural Selection, Genetic Drift, Mutations and Gene Flow. Some only take two or three generations to "take hold". Some take tens of thousands of years. Viruses - hours.
Generally there will be long periods of stable populations and then a dramatic change; could be within a generation.
You can see species that have become isolated in recorded history that have become a distinct groups from the rest of the population. Two examples in humans - lactose tolerance vs. intolerance and immunity to malaria. Not changes that make a separate species . . . yet. A more dramatic in the genes of individuals may make a difference that does favor one vs the other. It is suspected that most human adults would have been lactose intolerant prior to the domestication of cattle some 9,000 years ago. We lacked the internal bacteria to digest it.
Blood types in humans - Rh positive or negative. That may make a difference at some time. It is the difference in a protein that is on some people blood but absent in others. That's a big difference. And, again, may make a difference in the next generation or the next 200 generations.
Depends on the mechanism of change: Natural Selection, Genetic Drift, Mutations and Gene Flow. Some only take two or three generations to "take hold". Some take tens of thousands of years. Viruses - hours.
Generally there will be long periods of stable populations and then a dramatic change; could be within a generation.
You can see species that have become isolated in recorded history that have become a distinct groups from the rest of the population. Two examples in humans - lactose tolerance vs. intolerance and immunity to malaria. Not changes that make a separate species . . . yet. A more dramatic in the genes of individuals may make a difference that does favor one vs the other. It is suspected that most human adults would have been lactose intolerant prior to the domestication of cattle some 9,000 years ago. We lacked the internal bacteria to digest it.
Blood types in humans - Rh positive or negative. That may make a difference at some time. It is the difference in a protein that is on some people blood but absent in others. That's a big difference. And, again, may make a difference in the next generation or the next 200 generations.
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