Essay on Evolution From A Molecular Perspective

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Evolution From A Molecular Perspective Introduction: Why globular evolution?      Evolution has been a heavily debated issue since Charles Darwin first documented the theory in 1859. However, until just recently, adaptation at a molecular level has been overlooked except by the scientific world. Now with the help of modern technology, the protein sequences of nearly every known living thing have either been established or are in the process of establishment, and are widely accessible via the internet. With the knowledge of these sequences, one can actually look at several organisms genetic codes and point out the similarities. Entire genomes of creatures have been sequenced, and the human genome project is well…show more content…
Hemoglobin is the carrier in blood that transports oxygen to our tissues and carbon dioxide out of our body, changing colors as it does so. Hence, hemoglobin has long been termed the pigment of our blood. Hemoglobin was one of the first proteins to be purified to the point where its molecular weight and amino acid composition could be accurately measured. This finding was very important in that it eventually lead to the understanding that a protein is a definite compound and not a colloidal mixture of polymers. Each molecule was built from exactly the same amino acid subunits connected in the same order alonga chain, and had exactly the same weight. Most organisms have their own unique, individual chain of proteins to make up their hemoglobin, but all organisms share certain similarities, so striking that they are unable to be ignored. Let's take, for example, the first twenty-five amino acids in the alpha hemoglobin chains of 7 different animals: a human man, rhesus monkey, cow, platypus, chicken, carp (bony fish), and shark (cartilaginous fish) (See Table 1.1.) As is shown, the variations increase the further apart the organisms are on the proposed evolutionary scale. A human man differs from a rhesus monkey only twice in the first twenty-five amino acids of their alpha hemoglobin chains, whereas a man and
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