Mutation

The Scars of Evolution Human bes, resembling all anformer(a)(prenominal) species on this planet, busy a history. We came into existence through a process of slow, abrasion trial-and-error, occurring over geological time via the sieve of differential survival. And like all species, our bodies and our genes reflect and bear witness to that history. Far from be perfect, one-time creations, we still bear the scars of the ontogenyary process that made us. This whole tone will discuss some of the lines of evidence which hint at tender-hearteditys past. I wont repeat that well-known example of an evolutionary vestige, the sort appendix. Instead, Im going to focus on a few other examples that arent as widely discussed. Toes. Its only because were used to having toes that we dont usually come in how strange they are. Why do our feet have these stubby, non-functional digits on the ends? They offert keep nearly as well as fingers, and we dont need them to corresponden ce or to walk. (Why not just have a amalgamated front of the foot?) By contrast, anyone who observes other primate species faeces see that they have, not two hands and two feet, and four hands, all of which are good for grasping.

As human race beings gained the ability to stand and walk upright, our feet lost their grasping function, on the face of it the digits themselves, though now shrunken and largely useless, remain. Lanugo. This little-known developmental phenomenon is an all-important(a) clue to our mammalian past. Lanugo is a coat of fine, downy shit that fetuses grow while in the womb, covering the entire frame except for the soles of the feet and the palms of the h ands. Typically, lanugo is shed by the seven! th or eighth month of pregnancy, although premature infants may retain it for several weeks by and by birth. The question is why we grow it at all, and the theory of evolution can easily explain this as a fundamental characteristic retained from our furry ancestors. Goosebumps. Fitting neatly unitedly with lanugo is the vestigial human trait called the...If you want to get a full essay, order it on our website: OrderEssay.net

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