Essay Disease Impact On Human Adaptation

736 Words Oct 30th, 2016 3 Pages
Disease Impact on Human Adaptation

Evolution describes interrelated phenomena, that govern an organism’s genotypic and phenotypic traits, essentially sculpting life as we know it. Typically, within all species there exists a spectrum of phenotypic trait variations, and these variations are influenced by various environmental factors, these factors are the tools for the process of natural selection- a mechanism of evolution. In species the diversity in trait variation stems from the “Struggle for existence” that an organism faces over several generations; however, it is important to note that only the best-adapted trait gains prevalence in the population.
Analytically speaking, this creates a bell curve function that describes a trait’s frequency across the population. Whereby, the least common trait exists infrequently at the edges of the curve and the most common trait is found at the center. Similarly, the variable environmental factors, over time, “selects” and changes the curve’s traits to describe the imposed changes. Depending on the circumstance, this creates a directional or disruptive adaptation.
With all this in mind, it has been debated that humanity is no longer subject to the rigorous process of natural selection, due to the leaps in medical advancements we are witnessing today. Herein, I review sickle cell anemia disease (SCD) and instigate an analysis of continued human adaptation in relation to sickle cell anemia (SCA), hypothesizing that we are still…

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