The concept of natural selection It is part of the theories proposed by the British naturalist Charles Darwin to explain the species evolution . According to Darwin , the various biological species share a common descent that has been branching through the evolution .
In that process, he states Darwin , the populations managed to evolve in their successive generations thanks to a mechanism that they called natural selection. Bliss selection It consists in the reproduction of genotypes according to environmental conditions, which hinder or benefit reproduction according to the characteristics of the organism.
Natural selection, in other words, implies that nature "choose" how organisms reproduce according to their properties and thus favor adaptation, promoting the evolution of species .
Darwin understood that natural selection respected certain premises. The scientist, in his works, explained that the selected feature is hereditary and that there is a variability of this feature among the specimens. This variability causes differences in biological adequacy (survival) and makes only certain characteristics of the new apparitions extend to the entire population . The accumulation of the variations that survive with the course of the different generations constitutes the Evolutionary process .
Natural selection is usually explained as the survival of the strongest or the fittest since the organism that subsists and evolves is the one that managed, thanks to evolutionary changes, to adapt to the environment. The other organisms, on the other hand, become extinct. The idea, however, is often questioned when it is transferred to other areas as it seems to justify the elimination of those who are weak or have problems of adaptation in their group.
Since Darwin (1809-1882) developed the theory at hand, there are many uses that have been made of it. Thus, for example, highlighted the one that deals with the development of antibiotic resistance in what are microorganisms. Drugs those that, since they were discovered in the decade of the 20s by Alexander Fleming, have been used to cope with various diseases that are considered to have a bacterial origin.
In the year 1859 it was when, for the first time, that man of science raised the aforementioned theory of biological evolution that became a real revolution at that time and that, at present, remains a fundamental milestone within science. So much so that, for example, it has come to shape other similar approaches. Specifically, we are referring to Neodarwinism or Neodarwinist Theory, which is a continuation of Darwin's work.
More specifically, it is said that this new theory becomes a perfect sum between the approach that concerns us with natural selection, the genetic theory developed by Gregor Mendel and the so-called mathematical population genetics.
Current science professionals are clear that natural selection takes place in a population as long as there are three fundamental factors such as differential biological efficacy, phenotypic type variation and inheritance of variation. Thus they determine that if these three elements occur there is a change in what is the genetic formation of the said population through natural selection.