Originally posted by Alchemist
View Post
A scientific theory makes predictions.
Evolution is a historical narrative.
We can't use evolutionary theory to come up with a cure for aids, or for genetically modifying babies to have 300 I.Q points. Nor can we manipulate nature into producing a species of organisms that would our garbage, or produce the energy we require to run our economies.
Mutations do no lead to beneficial traits!
There is no such thing as a beneficial mutation!
Whenever a mutation does happen, it is a defect! A loss-of-function.
I have already. But you don't have the knowledge base to understand what I am saying to you.
So much for your grasp of the english language, Mr. Native Speaker.
The key to understanding the evolutionary theorizing in biology is to understand how it relies on an unexplicated notion of "selection-for".
Phenotypic traits evolve in the direction of increased fitness. But then what about phenotypic traits that are not adaptations? Once you understand the problems associated with "Selection-for", you will see then adaptationism simply cannot do what an evolutionary theory is supposed to do: explain how phenotypic traits are distributed in populations of organisms. The theory of natural selection cannot predict/explain what traits the creatures in a population are selected-for.
.... so?
"Selection for a trait" is the pivotal notion in adaptationism; the central idea of adaptationism is that it provides for an entirely naturalistic mechanism of selection for phenotypic traits. Darwin assumed a mental cause, as he started out his discussion by eluding to artificial breeders who had an idea of what they were selecting for. So we should say that natural selection selects for whatever it has in mind in selecting. Going back to our discussion on Neanderthals and homo sapians...what made them go extinct and us flourish?
You can't really say for certain what phenotype gave them the advantage for certain but only presume that your race is 'the selected one" for some obscure reason. The values of a trait parameter that are viable for one kid of creature can differ radically from the values that are viable for another. Consider size for instance.
[quote]
Phenotypes aren't bundles of traits, they are mostly like fusions of traits. Same is true for ecological variables with which phenotypic variables interact. There may be a law to selection, but we don't have any, simply because in the real world phenotypic traits are coextensive and we don't observe in the real world a chance in on trait with everything else left intact.
Understanding the difference between select/select-for is a difficult one. You need to have an indepth knowledge of the "assumed" mechanism that performs the selection.
Look up -free rider problems.


Comment