Biological evolution is defined as any genetic change in a population that is inherited over several, successive generations. (R.Bailey, 2014) The changes accumulate and over time a new species is created. One of the basic mechanisms of evolution is Natural Selection. Natural Selection is random genetic variation occurring within an organisms DNA and the beneficial mutations being preserved because they aid survival. (C.Darwin, 1859) Two notable scientists associated with the theory of evolution include Charles Darwin and Jean-Baptiste Lamarck.
Charles Darwin in his book, On the Origin of Species, presents us with a theory of natural selection. This theory is his attempt at an explanation on how the world and its' species came to be the way that we know them now. Darwin writes on how through a process of millions of years, through the effects of man and the effects of nature, species have had an ongoing trial and error experiment. It is through these trials that the natural world has developed beneficial anomalies that at times seem too great to be the work of chance. Darwin writes on how a species will adapt to its environment given enough time.
At first, mutations may seem almost non-existent to the eye, but over time the mutation will become more visible. A mutation can either decrease or increase the chance of survival, depending on what the mutation is. If the mutation does survive and reproduce, this is when a population evolves. This all comes back into play in the Tree of Life. The Tree of Life was first seen in the 19th century, in Charles Darwin’s book On the Origin of Species.
The Future of Human Evolution Evolution, the science of how populations of living organisms change over time in response to their environment, is the central unifying theme in biology today. Evolution was first explored in its semi-modern form in Charles Darwin 's 1859 book, Origin of Species by means of Natural Selection. In this book, Darwin laid out a strong argument for evolution. He postulated that all species have a common ancestor from which they are descended. As populations of species moved into new habitats and new parts of the world, they faced different environmental conditions.
However, mutation is random in the evolution, and provides raw material for natural selection, genetic drift, and gene flow... ... middle of paper ... ...he genetic differences making more of a variation but it does this process slowly. Evolution is a on going process and the evolution is made up of many different processes. It allows species to become what they are, how they act, and what they will become. It also allows species to be able to survive. It produces new and different species through ancestral populations of organisms and moves them to new population.
Variations bring changes that only remain within the limits of the genetic information of an individual or specie, it is not possible to add new genetic information to them. Darwin’s natural selection theory is the most successful one because of the collected data and examples given to back up his theory. In other scientific researches, it is said that natural selection is not the only cause of evolution. Darwin even said himself, "The natural selection is an important cause of variation but not its sole reason."
Darwin’s theory of natural selection explained adaptations that helped a species to survive. Darwin also wanted to explain the changes that occurred through the success of mating. This theory is called sexual selection which can exp... ... middle of paper ... ...elds will because to better understand their field of study. It will help give these sub-fields a foundation on which to anchor their beliefs. Works Cited Blasi, C., & Causey, K. (2010).
His most famous book, On the Origin of Species by Means of Natural Selection (1859), is a landmark in human understanding of nature. Pointing to variability within species, Darwin observed that while offspring inherit a resemblance to their parents, they are not identical to them. He further noted that some of the differences between offspring and parents were not due soley to the environment but were themselves often inheritable. Animal breeders were often able to change the characteristics of domestic animals by selecting for reproduction those individuals with the most desirable qualities. Darwin reasoned that, in nature, individuals with qualities that made them better adjusted to their environments or gave them higher reproductive capacities would tend to leave more offspring; such individuals were said to have higher fitness.
Without evolution, and the constant ever changing environment, the complexity of living organisms would not be as it is. Evolution is defined as a process that results in heritable changes in a population spread over many generations (8).Scientists believe in the theory of evolution. This belief is based on scientific evidence that corroborates the theory of evolution. In Figure 1 the pictures of the skulls depict the sequence of the evolution of Homo-sapiens. As the figure shows, man has evolved from our common ancestor that is shared by homo-sapiens.
Charles Darwin had many theories that incorporated the main principle of biology, natural selection and evolution. Darwin explained natural selection as an evolutionary change where organisms that become more adapted to their environment will survive better than those who do not (Natural, 2004). Through evolution and natural selection many species, including humans, are here today. Charles Darwin founded the principle of natural selection, which describes how organisms that adapt better in an environment will survive better and produces more offspring (Natural, 2004). Darwin first noticed evolution after being on the Galápagos Islands; here, he noticed that geological separation played an important role on how organisms adapted and formed new species (College, 2009).