Sorry, got distracted elsewhere
Behavioural traits aren't genetic. They're just learnt behaviours. If the behaviour is both learned & harmful, the organism would stop doing it.
Well, no. In non-senescent species, the organisms live for very long and can reproduce throughout most of their existence. If humans were living immortally, then eventually they would become so full of mutations that you would be introducing many mutations into the gene pool.
One consequence would be that some of the good mutations would get wiped out if the bad ones are linked to the good ones.
So survival is not really all about reproduction, it's about healthy reproduction.
The problem is that you would create a bad mutation in Organism X. Organism X then reproduces with Organism Y (unmutated). Offspring have one allele mutated (2 are needed). Say 4 offspring are produced, 2 may have the mutation. It passes to their offspring, and eventually it becomes multiplied up. Eventually many offspring are going to have the double mutated allele. This will cause a problem. It is nature's way of preventing such a situation from arising.
I'm not sure. But perhaps it is more likely to have a bad mutation occurring than a good mutation.
The reason might be the specificity of DNA.
Yes, alright. The number of offspring will increase, but the number of healthy offspring will probably decrease.
Because we've only recently developed supermarkets and the ability to shuffle goods around.
We may eventually become non senescent if this was the driving factor behind the evolution of human sensescence.
I would agree. So this might reduce the number of mutations and control population numbers.
Originally posted by Mayana
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Behavioural traits aren't genetic. They're just learnt behaviours. If the behaviour is both learned & harmful, the organism would stop doing it.
Survival just implies more reproduction and more reproduction just implies survival. Circular reasoning works because circular reasoning works. What is the point behind it, from an evolutionary perspective?
One consequence would be that some of the good mutations would get wiped out if the bad ones are linked to the good ones.
So survival is not really all about reproduction, it's about healthy reproduction.
No, they would just be introducing a lot of genetic variation - the harmful of which would be selected against. The mutations of one organism do not affect the healthiness of the other organism. The harmfully mutant one is just taken out of the gene pool.
How so? If mutations (variation), heritability, reproduction and selection are all that is needed for evolution, how can too big of a variety be bad? Chances are you get a lotta bad genes, chances are you get a lotta good genes as well - the bad ones are gonna be selected against anyways so there would more good ones.
The reason might be the specificity of DNA.
But, in that scenario, the young are selected against, not the adults. And the population would go extinct. The limiting factor here was not the population size but the limited resources. Natural selection has no sense of population size.
Let's agree on that for argument's sake. Given that by that logic senescence only exists to account for limited resources, why then is there senescence in human beings now?
We may eventually become non senescent if this was the driving factor behind the evolution of human sensescence.
Sexual maturity & reproductive fitness and senescence are not the same thing. If anything, lack of sexual fitness is a result of senescence and not vice versa.




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