the causes of evolution

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Biological adaptation occurs as a population develops physical changes that enable them to survive and reproduce in their environments. In the year 1859, Charles Darwin published his discovery of evolution, the origin of organisms by natural selection. Development is responsible for the major resemblances that exist in life, as well as their astounding diversity. The allele frequencies in a given population may change as a result of the four basic mechanisms of evolution: genetic drift, gene flow, natural selection, and mutation. The first underlying cause of evolution is natural selection and happens when some individuals with particular characteristics in a populace possess a superior endurance and the rate of reproduction than the rest and convey the transmissible hereditary features to their progeny. In the natural selection’s evolution, the reproductive and the inherent traits that attest beneficial to continued existence prevail into the future procreation. The cumulative impacts of the process of natural selection have given rise to the inhabitants that have advanced to be successful in the given settings. A good example is in the way of the adaptation of the finch birds to be advantageous when it comes to the feeding in the various natural niches (Nectunt, 2017).

Another mechanism of evolution is the genetic drift which comprises of the unsystematic fluctuations in the occurrence of the genetic material manifestation, usually, in the small populations. The procedure may lead to the complete disappearance in the gene variants thereby resulting in the reduced genetic inconsistency. In comparison to the natural selection, the pressures due to the adaptation or the environments do not coerce any alteration because of the genetic drift. The process is usually stochastic and takes place by probability in nature and alters the allele frequency in a population due to the error in sampling from one generation to another. Some of the alleles may get lost completely in a generation even though they are traits that are of benefit when it comes to the success of reproduction in the genetic drift.

Mutation is also another cause of evolution; it is the alteration in the sequence of DNA in the gene of an existing creature. A lot of mutations are neutral that is they offer no damage or advantage; however, they can also be harmful or useful. When they are injurious, they can interfere with the phenotype and consequently decrease the organism’s fitness and elevate the susceptibility to various infections. Conversely, when the mutations are valuable, they can result in the success of reproduction and the adaptation of an organism to the surrounding. There can be the spreading and the fixing of the beneficial mutations in the populace due to the process of natural selection if they can assist the organisms in reaching sexual mellowness and prosperous reproduction (Nectunt, 2017).

The final means of evolution is the gene flow which is the transmission of genes from the population’s gene band to a different one. The gene flow may perhaps transform the incidence and the range of alleles in the inhabitants due to the relocation of individuals or germ cells that have the capability of reproducing in a particular population. When there is the introduction of the new alleles in an environment, there is the increased variability in a population thus allowing for the new amalgamations of the qualities. An excellent instance of the gene flow is in the plant communities through the spread of the pollen grains over long distances to other environments through wind or insect dispersal, and upon reaching the new population; they end up fertilizing another plant.


Nectunt. (2017). Mechanisms of Evolutionary Change | Nectunt. Retrieved from

January 05, 2023

Science Sociology

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