Kimura's neutralist theory

In this BIOLOGY video we will explain the "Kimura's neutralist theory".

The neutralist theory of evolution arises from the hands of the scientist Kimura in 1968 and from 1980 onwards. forward, thanks to advances in genetic knowledge, molecular biology... it was possible to delve into her. Kimura observed the following: even in individuals of a single species, who share the same protein such as hemoglobin, for example. We find that there is a difference in the composition of the amino acids that make up said protein. This means that there are different triplets (that is, different nitrogenous bases or nucleotides, more specifically speaking) that generate these different amino acids.

Which is weird because, we take into account that a gene is something shared by individuals of the same species and it was not very clear what because these variations pass within a single type of protein, which in principle would have to be the same for all members of the species. So Kimura what he proposed is the following: unlike what he proposed

neo-Darwinian theory in which, the mutations mainly generate greater or lesser adaptation to a certain environment for the organism that possesses it. He thinks not. He believes that most mutations are neutral and that in fact, natural selection intervenes rather little on the molecular scale. This is important to understand. Kimura He is not opposed to natural selection but is of the opinion that at the molecular level mutations basically have mostly neutral effects. They pass a sequence of nucleotics or others, more due to random reasons than to the fact that they are more or less adapted for a certain organism.

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