danaman5 said:1. Environments change over time.
2. Allele frequency changes in animals occur over time. Simple variations during meiosis are usually responsible.
3. Some of the combinations of traits resulting from allele the changes allow the animals that have the combinations to survive more frequently and procreate more frequently.
4. Through genetics, the traits that work best in the environment in question are passed down to the offspring of the animals that have them. (Offspring occur more frequently for these animals, remember)
5. Since there are now more animals alive who possess the beneficial combination of genes, they too have more offspring, and before long almost the entire population has the change.
6. If the animals are suited to the environment, no additional change will occur, because no group will procreate more frequently than the majority group that now exists.
7. If the animals are not suited well enough for their environment, positive change will continue. Lasting negative change will not occur because those members of the population who have the more negative gene combinations will not consistently outlast the members who have the positive combinations.
8. If a change is neutral, some of the population will have it but others won't. (Example: eye color in humans. There is no real advantage to having one eyecolor over another, so the trait is not selected out as people with all different eye colors can see equally well on average)
9. Positive changes will build up over time as more positive variations present themselves in the population.
10. Eventually, with so many differences between members of a species who live in one type of environment, and those members of the same species that live in a different environment, the two groups will no longer have enough in common physically to produce fertile offspring. By definition, this constitutes the formation of a new species.
Well, there you have it, ten things that will never be disproved. The reason that I can be so confident is that the ten steps listed above are really just an example of cause and effect. There is simply no way that they could not happen given the occurrence of items number 1 and 2 in the list. Unless you dispute that environments change and variations occur during procreation, the rest must logically stem from that.
Hey guys. I know I said in my last post that I was very pressed for time at the end of my school quarter's weeks, but I saw a couple topics that moved me to post again. (So I guess don't panic if I don't reply at a decent time)
Anyways.
danaman5
I don't know where you got this info from, but I think that with a few of them you are correct. Absolutely there are changes within a species. That would explain why there are so many variations of canines, cats, moths, it is endless. I need to point out here that there is plenty of evidence for microevolution. However, have you checked out, I mean deeply/thoroughly checked out all the evidences is for macroevolution (change from one species to another)? Have you looked into the recordings of how "ape-men" were discovered? If you have though, what do you think about the evidences presented and their reliabilty to strongly support the theory of macroevolution? Interesting subject by the way.
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