Luke321

I see my problem now, thank you!

I understand what you are saying. Small changes can have a big effect in a few generations or longer, even if they begin small. But doesn't it seem weird to you, in my example, that the change is so minimal, but still is the prefereble gene? I know that that is what the theory says, maybe I'm more interested if anybody has ever thought about it?

I understand,but it seems weird that in the beginning of that proces of change, the diffrences are so little. So It seems to me it wouldn't matter. I mean if one rat has a light color, and another rat has a slightly darker color, but still a fairly light color, comparing to the black surface of the ground, it wouldn't really matter for, for example an owl or an eagle to see them both fairly equally. I mean I can probaly tell the difference from a 100 feet or more. So I understand the principle, but I question if, at least in some cases, it really matters?

Hello everyone, Recently I got very interested in Biology and especially genetics and evolution. But I have a question that I don't seem to get answered, or maybe I don't understand the answer enough, so I wondered if somebody could help me out? So the question is how DNA "knows" wich phenotype it needs to be? What I understand from evolution theory (I'm still studying it so correct me if I'm wrong) is that organisms that adapt better to certain enviorment, are more likely to survive and reproduce, so there will be more organism with the certain gen that produces the favorable type of change. An example wich I saw in a documentary got me thinking. The example was a desert rat that first had a brown fur, the same as the sand, and when volcanic eruptions took place, and the soil became black rocks, it became black. I understand that the certain gen that produces a black fur is then favorable but how does the DNA "know" (I know DNA doesn't know anything like humans do but I don't have a better word for it now) to turn more black. It isn't true that the rats become purple and yellow and green and black, and than the black ones rats are better adapted so they survive, right? So how does the DNA know this? Or am I thinking about it in the wrong way? I hope somebody can answer my question and correct me if I'm wrong in any of my assumptions.