Pros And Cons Of Natural Selection

2 The Human

I have called this principle, by which, each slight variation, if useful, is preserved, by the term of Natural Selection. … Natural selection will never produce in a being anything injurious to itself, for natural selection acts solely by and for the good of each – Charles R. Darwin, about evolution from The Origin of Species.

Every living being is programmed to evolve. Evolution is a fascinating thing to think about. It is especially interesting when you observe yourself in human time scale evolving as human being. Earth was created around the geological time scale of 4.5 billion years ago, and life started evolving soon after. Life existed when Earth was still a volatile environment with the evolution of organic molecules

A major event in time-line was the development of sexual reproductions – creating copies of parents -- leading to faster evolution. The copy (offspring) was unique, containing only 50% of genetic material from each of 2 parents, plus any changes caused by natural selection, a process by which genetic mutations help an organism to survive by passing good ones from one generation to the next after eliminating harmful ones. Overall, diversity in the species was increased, causing differences and thus selective advantages i.e. advantages in comparison to one another within the species, and in relation to their environment. Natural selection took effect on the unique organism. Organism had to adapt fast enough to their environment to stand the test of the time. And since beginning of biological evolution as a single cell, life evolved into a spectacular array of sizes and shapes: from ant to elephant, from bees to birds, plants and animals and especially the life evolved from a tinny microbe to

Homo sapiens, as they were named meaning wise man, were the significant shift towards modern man. They existed as early as the tools being used, were becoming more sophisticated, that allowed them to easily adapt to its surroundings. They, as spices, were occupying a diverse range of continents, therefore, greatly diversifying the gene pool over a long period of time. And that resulted humans today with variety of skin colors, body types and facial features. [Info: Darwin said, "There is no fundamental distinction between species and varieties (varieties: any of various groups of plants or animals ranking below a species)." The cat shares 95.6% of its DNA with the tiger. They diverged on the evolutionary tree about 10.8 million years ago. Human DNA studies reveal that all humans are surprisingly similar – 99.9% genetically identical. Our hereditary differences – from our eye color to our risk for certain diseases – stem from only 1/10th of 1% making such a huge difference from one person to another. The reason is that our DNA contains more than 3 billion bits of information and this tiny 0.1 percentage amounts to more than 3 million attribute the differences. Moreover, many of our individuality are not direct result of genes; they are developed from environmental, social and cultural influences, as well as from individual behavior and