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A few questions on natural selection

by Manraj singh
Tags: natural, selection
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Manraj singh
#1
Jun26-14, 11:48 AM
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I know very little about natural selection, so:
Why didn't all the creatures evolve? I mean , why is it that some fishes came to the land, or why did not all monkeys turn into humans? And is it possible that someday the monkeys on the trees turn into humans?
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Travis_King
#2
Jun26-14, 01:14 PM
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Read the wiki to get a basic understanding of evolution and natural selection: http://en.wikipedia.org/wiki/Natural_selection

Regarding your second point: No. It is possible that some small population of "monkeys" evolves into a separate/new species over the course of several hundred thousand years, but they will never evolve into humans. The most basic point about human/monkey evolution is: "We did not evolve from monkeys." We evolved from a common ancestor.
See here: http://cnx.org/content/m44696/latest...e_29_07_03.jpg
Manraj singh
#3
Jun27-14, 05:47 AM
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Thank you

Jobrag
#4
Jun27-14, 10:17 AM
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A few questions on natural selection

Suppose you have a group of apes living at the edge of a forest, one male has a genetic mutation that allows him to climb trees better, he takes some of the females deeper into the forest where his offspring inheriting the tree climbing gene thrive in the forest, another male mutates to walk upright more easily and the same thing happens on the plains. This is horribly simplified but different mutations and those mutations occurring in different environments will cause species to diverge.
Manraj singh
#5
Jun27-14, 11:19 AM
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Oh. So 'adapt to survive.'
dkotschessaa
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Jun27-14, 11:26 AM
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Quote Quote by Manraj singh View Post
Oh. So 'adapt to survive.'
Yes, so the answer to "why didn't all creatures evolve" is really, "they did all evolve." Every creature alive evolved to fit it's particular niche.
Manraj singh
#7
Jun27-14, 11:28 AM
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Quote Quote by dkotschessaa View Post
Yes, so the answer to "why didn't all creatures evolve" is really, "they did all evolve." Every creature alive evolved to fit it's particular niche.

Thats my question. If i am not mistaken, fishes came into existence before land animals. So, why did only some fishes come out, or 'want' to come out.
micromass
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Jun27-14, 11:37 AM
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Quote Quote by Manraj singh View Post
Thats my question. If i am not mistaken, fishes came into existence before land animals. So, why did only some fishes come out, or 'want' to come out.
First of all, there is no "want" in evolution. Evolution is a mindless process. It just happens. It has no goal or desires.

What if I ask you the following question: "Some Europeans came to America when it was discovered, why didn't they all come?" It's not an answer, but you should think about it. A possible answer is that many Europeans didn't have the financial means to go to America, and a lot also had it quite good in Europe.

In the same way, a lot of fish didn't have the right genes to come to land. And they had it quite good in the water, so they didn't suddenly all die if they remained in the water. So there is no real disadvantage in staying in the ocean. So their offspring will also not have the right genes and will also not go on the land.

Compare this with the evolution of the peppered moth: http://en.wikipedia.org/wiki/Peppered_moth_evolution Here we indeed have a significant disadvantage for the moths who were not black. So the genes of black moths were much more likely to survive than the genes of the white moths. This did in fact cause most of the white moths to be replaced by black moths.
Manraj singh
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Jun27-14, 12:51 PM
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Thanks


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