Why does only one of these (which one?) lead to adaptations?
Thanks for your help!!!! Best answer gets 10 points!!!!
2007-12-12 09:29:25 · 4 answers · asked by R & L C 2 in Science & Mathematics ➔ Biology
It would be best to look at your notes from lecture as your instructor may have presented evolution in a particular way to come up with five different means of influencing evolution.
If you are only looking at things that would influence the rate of change of alleles in a population over time, some factors to consider are:
1. Mutation rate. Different environmental conditions can alter they rate at which mutations are introduced into DNA.
2. Gene flow. Evolution happens in a population. If there is movement between populations, that can alter the gene pool.
3. Genetic drift. Evolution can happen in the absence of selective pressure simply from random mating.
4. Sexual selection. In sexual reproduction, mate selection can drive the development of traits, even those that would be a liability when confronting a predator.
5. Natural selection. This is the most powerful force. Even a slight difference in reproductive success will lead to a rapid change in the gene frequency of a population.
Out of all of these, I would say that only mutations lead to new adaptations. All of the others act on traits that are already present.
2007-12-18 20:13:09 · answer #1 · answered by Nimrod 5 · 0⤊ 0⤋
I'm waiting for Secretsauce too. I can't think of that many. Anyway:
1. Mutation, chromosomal events, viral lysogeny, polyploidy events
Mutation is the way new alleles are made.
Through viral lysogeny new genes can be brought in.
Chromosomal events can delete genes, or duplicate genes.
Polyploidy is a quick cheap way to duplicate a lot of genes.
2. Gene flow (formerly known as migration)
This can bring new alleles into a semi-isolated population.
3. Isolation/Genetic drift
One of my favorites! Genetic drift acts on an isolated population. Alleles can be lost from a limited population through chance or accidental deaths!
4. Selection
Reproduction is limited to those who survive long enough to breed. Expressed traits in individuals can improve, or decrease, the chance the individual bearing them will be successful reproductively.
2007-12-12 11:11:22 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The best answer I can give is to wait for secretsauce to see your question, and use that.
2007-12-12 09:40:03 · answer #3 · answered by Labsci 7 · 0⤊ 4⤋
i really have no idea
2007-12-12 10:51:17 · answer #4 · answered by ? 3 · 0⤊ 2⤋