THEORY OF NATURAL SELECTION

Theory of Natural Selection

Theory of Natural Selection

Theory of Natural Selection

Natural selection essentially states that "the strong will survive." The basic idea is that when changes occur, those organisms best suited to new conditions will flourish. Those who are not perfect will not be able to compete. Charles Darwin proposed that this principle after observing some variations of bird population. He noticed that the animals within a species is often slightly different features, and that these qualities make it even more suitable for certain conditions. Natural selection is an integral part of the theory of evolution (Haldane, 2003). This theory is credited to Charles Darwin, explains the influence of environmental impacts on the physical characteristics of any population. Usually, those characteristics that make it easier for species to survive, and cause it to reproduce successfully and thus become more noticeable in subsequent generations (Futuyma, 2005).

Variations allow for natural selection

Offspring have some genes from each of two different parents and therefore are not identical clones of their parents. Increased due to a change in sexual reproduction allows natural selection (and hence evolution) to bring about changes in populations. Evolutionary changes caused by the natural selection would not be necessary if the environment never changed; organisms in the environment have been optimally adapted to the environment. One of the conditions necessary for natural selection lead to adaptive evolution, new signs and speciation is the presence of inherited genetic variation that leads to fitness differences. Genetic variation is the result of mutation, recombination, and changes in karyotype (number, form, size and location of internal chromosomes). Any of these changes may have an effect which is very advantageous or disadvantageous, but large effects are very rare. In the past, most of the changes in the genetic material were considered neutral or close to neutral, because they occurred in non-coding DNA, or by the substitution of synonyms (Lotka, 2005). However, recent studies have shown that many non-coding DNA mutations have small deleterious effects.

Mechanisms of evolution

The word "evolution" refers to changes in the genetic composition of the population. Natural selection produces evolutionary change, because changes in the genetic composition of the population.

Evolution is a process by which modern organisms are descended from ancient ancestors. Evolution of the responsibility for both the remarkable similarities we see through his life and amazing that the diversity of life (Sober, 2008).

Fundamental to the process is genetic variation, ...