Evolutioncan be defined as the process by which living organisms havetransformed and developed since their earliest forms in history(Serrelli & Gontier, 2015). There are two levels of evolution innature where one is much broader in its approach to studying thechanges in organisms over time than the other. This paper attempts todefine and distinguish between these two levels of evolution.
Thislevel of evolution observes smaller changes occurring within a singlepopulation of organisms over a period. The observed changes withinthe population do not result in the evolved organism being considereda new species. Physical observable traits separate from its earlierform include changes in size and color (Serrelli & Gontier,2015). These are attributed to the frequency of occurrence of allelesin the genetic make-up of the population. Factors that contribute tomicro-evolutionary changes in species include mutations, gene drift,random mating and natural selection among others.
Thisgrand scale level of evolution refers to observable changes inorganism populations that are significant enough to result in theemergence of a new species or larger groups like families, over time.The resulting new organisms are not compatible with their earlierforms to the point that they cannot mate (Serrelli & Gontier,2015). Proponents of macro-evolution base their reasoning on theproposition of a single ancestry for all living organisms. Similarfactors that contribute to micro-evolution over time result inmacro-evolutionary changes in the population.
Thedistinction between these two terms has been said to be artificial bysome biologists. This is because macro-evolution is a result of thelong-term effects of micro-evolution. However, proponents of thecreation theory support micro-evolution to a small scale. They arguethat a horse can grow bigger or smaller over time but can never‘macro-evolve’ to become a goat.
InSerrelli, E., & In Gontier, N. (2015). Macroevolution:Explanation, interpretation, and evidence.Cham: Springer