stevevw
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- Nov 4, 2013
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For evolution or rather for changing internal and external conditions in order to adapt and survive there are many forces that support agency. For example Niche Construction is when creatures control their own environments making them conducive of fitness and survival.What would count as evidence of agency?
Examples are Beaver dams and ant nests to name a couple of obvious ones. But also there are many micro accommodations such as the nesting environments. Humans are the best at this as we have shown we can turn just about any environment into being conducive for survival. Even to the point of bypassing natural selection.
The basic idea is that rather than natural selection doing the sorting by weeding out the unfit it is the creature themselves doing the selecting of their own environments or conditions or making them suitable by the inside knowledge they have about nature and the intelligent choices which are beneficial and adaptive.
Developmental Plasticity means the capacity of existing phenotypes to vary to environments due to natural developmental capacities and recipricle relationships to others and environments. Without the need for a change in core genes. The earth worm is an example of how once removed from water can metabolise the soil to create its own watery environment for survival. Plants will adjust according to the level of light.
Its only later after continued aqasition of these plastic changes that the genes will cement those changes in place. But its certainly not random but an ability to adjust to environments pre genetics through cells and tissues. Thus this supports a self organisation which puts the creature in the driver seat due to inbuilt natural abilities. Rather than being passive entities acted upon by some programmed process.
Then you have inheritence beyond genes. This includes culture, epigenetics and other influences like HGT and symbiosis which is how creatures can coevolve, gain genetic info from surrounding organisms and environments. Or parasites living on other organisms such as the fruit worm who uses fruit as its cocoon. Or the dung beetle. Thus having an ideal already created beneficial environment thanks to nature. Its the organisms ability to know this and benefit from it making them more central to directing their own fate.
But basically as with epigenetics its the conditions one generation lives under that determine expression of the genes for the next without changing the core genes. How creatures live and especially humans is also down to their choices, their agency. You reap what you sow so to speak. Research now shows that epigenetic changes can be passed on to the next generation.
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