HamburgerBoy
Active Member
- Sep 16, 2007
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Environments don't "cause" mutations to occur. They provide circumstances in which certain mutations prove beneficial, and those organisms pass their genes on to future generations. The finch evolves the beak it does entirely by accident. The finch perpetuates because its beak is conducive to its particular environment.
Your second paragraph began "Environments don't put pressure on individual organisms, since individual organisms don't mutate during the course of their lives (generally speaking)." and your third paragraph began "It may look like environments direct organisms through channels, but environments themselves don't dictate the anatomical consequences that any given mutation will assume. An organism's anatomy cannot be shaped by the pressure of its environment.", which were what I was responding to. What you're saying right now seems to be what I'm saying and in contradiction to your previous post.
In the context of previous posts about the why vs the how, I think it's clear that environment dictates why various organisms evolved different mechanisms of sexual dimorphism. Angler fish live in large, dark bodies of water with low population densities; therefore, a mechanism where the male permanently fuses with the first female it comes into contact with evolved to maximize reproductive potential in response to environmental pressures. Same thing with giant squids holding onto sperm for long periods of time. In contrast, land animals are able to cope with more elaborate, competitive modes of reproduction, usually involving a physically stronger and showier male attempting to attract a female, due to a very different kind of environment. In humans, that divide between the sexes is retained and we see obvious biological reason for gender roles.
that shit is hilarious