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  #1521  
Old October 10th, 2009, 3:59 am
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Re: Creation & Evolution

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Originally Posted by Tenshi View Post
From the few things I understood (sorry am not fluent in "Scientific English"), from the very few things to be honest, because it's like we would say "technical Chinese" to me. Please remember that not every member is a native English speaker or familiar with the scientific terms. So maybe is there some easier to understand explanation?

Doesn't there need to be a trigger to make the changes happen? It's not that it suddenly changes for no apparent reason, right?
I've been trying to find some sources in a more palatable English - scientific jargon is off-putting, I agree.

Generally, yes, there will be a trigger. Basically , where plasticity deviates from genetic variation is that plasticity does not have the factor of changing genetic frequencies explicitly stated. Rather, it applies only to environmentally-induced factors. It's a somewhat arcane term, and I kind of regret bringing it up because it's not fully understood to the degree that other aspects of evolution are.


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  #1522  
Old October 10th, 2009, 4:10 am
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Re: Creation & Evolution

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Originally Posted by Tenshi View Post
Doesn't there need to be a trigger to make the changes happen? It's not that it suddenly changes for no apparent reason, right?
The most basic changes are genetic mutations, which don't need an environmental trigger. A substitution of one nucleotide base (component of DNA) for another; an extra copy of a sequence of DNA; a sequence of DNA inserted into a different location on a chromosome.

A good many of these changes do not have any noticeable effect on the individual they occur in, and are neutral -- they may occur in a section of "junk" DNA that doesn't actually code for anything. Some mutations are bad, and cause a gene not to work properly; and if a bad mutation prevents an individual from reproducing & having offspring, then it will be selected against. Occasionally a mutation could be beneficial or could modify the expression of a particular gene; if it helps the individual to produce more offspring than the ones that don't have this mutation, the number of individuals that have this mutation will eventually increase and become a larger proportion of the population. Sometimes, mutations that occur in an extra copy of a gene can eventually result in a new gene.


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  #1523  
Old October 10th, 2009, 4:43 am
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Re: Creation & Evolution

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Originally Posted by leah49 View Post
How do we know that is due to evolution and not just due to the animals not all having the same type of eyes? Our eyes aren't the same as spiders. It's just genetics.
Evolution predicts that there will be a steady stream of different eyes, going from very simple light sensitive spots, through eyes that can determine which direction light is coming from, eyes that can form simple blurry images through to eyes like ours that can form clear sharp images.

And these eyes that evolution has predicted have been shown to exist.

And we find that the creatures that have the simplest eyes are the ones most primitive. As the creatures become more and more modern (that is, they first appeared more recently), they display more and more complex eyes.

True, some primitive creatures have continued to evolve eyes that are better, but the fosil record can show us what the eyes of earlier forms were like.


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