By comparing Neutral theroy of evalution & Darwinn theroy of evulution . can evulution occur?

Question

When Neutral theroy says that Genotypic changes which occur most of them will not produce any phenotypic changes. So By only survival of fittest & natural selection & hypothitical isolated environment can evalution occur

Answer 1

Most evolutionary biologists have no problem reconciling the two theories. The previous posters have pointed out that even in a case where the vast majority of mutations are nuetral (have no effect) the occasional advantageous or deleterious mutation still arises and is acted on by selection.

But a key part of the theory that the other posters missed is the concept that most evolution is the result of genetic drift, meaning that some event occurs that allows mutations to "establish" themselves in relative isolation. This is where the theory of nuetral evolution comes into supposed conflict with Darwin, who surmised that all of his finches evolved into different niches even though they were obviously trapped together in a limited geographic region.

The reality is somewhere between the two. If a mutation has a positive enough selection effect you don't need drift or isolation to fix it in the population. However, if the fitness effect of a mutaion is very minor or neutral, it takes a random effect like drift for the mutation to become fixed.

Answer 2

You answered your own question.

As you said "most of them will not produce any phenotypic changes." That means that some of them do. That's enough for natural selection.

To quote wiki:
"The neutral theory of molecular evolution (also, simply the neutral theory of evolution) is an influential theory that was introduced with provocative effect by Motoo Kimura in the late 1960s and early 1970s. Although the theory was received by some as an argument against Darwin's theory of evolution by natural selection, Kimura and most evolutionary biologists today maintain that the two theories are compatible: "The theory does not deny the role of natural selection in determining the course of adaptive evolution" (Kimura, 1986). "

Answer 3

Yes, it still occurs. Not all genotipic changes cause a phenotypic change, but those changes still occur. The results are sifted by Natural Selection. It is still evolution.

Answer 4

Yes...not all the mutations will be solely genetic. Some will produce phenotypic changes which, if advantageous to the organism, will result in evolution over time.