What Is Evolution And What Is Natural Selection?

1160 words - 5 pages

EVOLUTIONa.What is evolution and what is natural selection? (8 marks)The theory of evolution arises out of man's need to explain the origins of both the Universe and Life. Evolution may be defined as that continual natural process through which organisms have acquired their peculiar structure and functions. Whilst this is the generally accepted explanation to the origins of the Universe and Life in history there have been many other theories put forward, such as spontaneous generation that is the belief that living matter can be generated from non-living matter.In layman's terms evolution is the process responsible for the changes over the extent of Earth's existence. Evolution began with the development of certain conditions on Earth which were favourable to the formation of life and the changing of these simple life forms over time into the organisms observable on earth today, including humans.Darwin, though not the first to contribute to the idea of evolution is often credited with its development. It was after his joint presentation with Wallace that evolution really began to gain widespread acceptance in society. In his book "Origin of Species" Darwin proposes a two-part argument to support his evolutionary theory, 'Struggle for Existence' and 'Natural Selection'.The 'Struggle for Existence' argument proposes two principles; the principle of reproduction which states all living things are potentially able and possess the drive to reproduce at rapid rates. The second principle of dependence states that all organisms depend on natural resources such as air, water and a source of energy. To these principles three factual observations were made. The first is that there are limited numbers of places on earth where there are these natural resources exists. The second states that the locations where these natural resources exist may fluctuate over time. Thirdly much variation exists in the form and behaviour of organisms.When combined these principles and observations led Darwin to two conclusions. The first is that because there are more organisms produced than the natural resources can support a struggle for existence must ensue. The second conclusion says that the struggle for existence may explain the patterns of quantities and variations found amongst organisms on the planet.In the second part of his argument ' Natural Selection' he identifies three principles. The first was that some organisms possessed certain traits that allow them to obtain more resources that others do not. The second states that organisms tend to reproduce very similar offspring. Thirdly he stated that organisms possessing advantageous traits have higher survival rates and thus higher reproduction than those without. Following these three principles he offered three factual observations. The first was that struggle for existence exists in nature. Second was that a good deal of variation occurs in the traits and behaviours possessed by organisms. Thirdly, some traits and...

Find Another Essay On What is evolution and what is natural selection?

Charles Darwin and The Theory of Evolution by Natural Selection

530 words - 2 pages offspring. However, the type of plant or animal that is less adapted to its surrounding -for example if it was not camouflage or if it was weaker that other types of the same species- would die out much quicker.Darwin had just explained how evolution could happen!When Charles Darwin published his ideas about natural selection, it caused one if the biggest arguments in scientific history. Many people disagreed with Darwin and they were unhappy about the

Darwin's Theory of Natural Selection and the Evolution of Animals

953 words - 4 pages Darwin’s theory of natural selection has provided us with the explanations of the processes involved in the changes of species over long periods of time. His theory was based on five major assumptions: VARIATION: When Individuals within a species differ from one another in physical characteristics and in their behaviour. HERITABILITY: Some of the variations amongst the members of species is inherited, meaning

Natural Selection and Darwin's Theory of Evolution (As proven in a Variation Lab)

1646 words - 7 pages pattern for the length measurements is found in each species? This can easily be explained through the application of Darwin's Theory of Evolution. Specifically speaking, a mechanism called "natural selection" explains why we see this common data trend. Natural selection acts to preserve and accumulate minor advantageous genetic mutations. Suppose a member of a species developed a functional advantage (it grew wings and learned to fly). Its

Charles Darwin's Theory of Evolution by Natural Selection

787 words - 3 pages Charles Darwin's theory of evolution centres on the idea that species compete to survive, and favorable characteristics are passed on from one generation to the next. Darwin said that evolution took place by a process of natural selection or survival of the fittest. This meant that the animals and plants best suited to their surroundings survived and were able to pass on their genes to their offspring. The ones that

The Process of Human Evolution Through Natural Selection

1057 words - 5 pages The process of human evolution through natural selection is an idea and a reality that is commonly misunderstood by a part of society. The process of natural selection is a continuous ongoing process that affects all living beings no matter what genus, species or even life form, all forms of life that are capable of reproduction are affected. In order for natural selection to take place there has to be a reproduction process that takes place

Charles Darwin's Theory of Evolution by Natural Selection

1707 words - 7 pages analyze and collect data that would later back up his evolutionary theories (Campbell p 424).      Even as Darwin collected his data pertaining to what would become his theory on natural selection, many pre-existing views still had a hold on the scientific world as well as the public. The earliest recorded were those of Plato and Aristotle. Plato (427-347 BC) believed in two worlds; an illusionary which was perceived only through our senses

Charles Darwin's Theory of Evolution by Natural Selection

1983 words - 8 pages Evolution. Is it a fact or fiction? Darwin’s theory has had a great impact on the world today. It has caused many debates between religious authorities and those from the scientific community. This theory prompted individuals to think about the origin of life in the universe. What distinguishes Charles Darwin from the others is the fact that he collected and provided substantial evidences and he related various branches of science such as

Charles Darwin's Theory of Evolution by Natural Selection - 2026 words

2026 words - 8 pages including the geographical distribution of organisms, comparative morphology of living organisms and their fossil precursors. They postulated that long-term environmental changes including movement of land masses and changes in climate could have served in the process of natural selection over many generations with the result that diverse species arose from ancestral types. Darwin termed this "descent with modification" (the term "evolution" was

Does the theory of evolution by natural selection make testable predictions and how should evolutionary theories be tested?

851 words - 4 pages larger theory of evolution and has received much attention largely due to ‘survival of the fittest’ and resulting testability. Understood simply, natural selection is the view that evolutionary change arises through a gradual, non- random process which produces variation in each generation. Organisms possessing characteristics which increase the likelihood of survival will have greater opportunity to reproduce and consequently their offspring will

What Is Evolution?

324 words - 2 pages Evolution is an unpredictable and natural process of temporal descent with genetic modifications that is affected by natural selection, chance, and changing environments. An easier more simplified definition is a change in the gene pool of a population over time. A gene is a hereditary trait that can be passed on for many generations.The gene pool is the set of all genes in a species or population. In order to understand evolution, it is vital

Lamarcks Influence Upon Charles Darwin's Theory of Evolution by Natural Selection

1768 words - 7 pages , those that vary by good fortune are better suited for the environment and leave more surviving offspring. A species would have this beneficial trait through random variation. Then, the characteristic would help the animal survive, while the others died off. This ensured that the beneficial trait would get passed on. This explanation is similar to Lamarkism, with obvious adjustments. Darwin simply showed that natural selection is, above all, a

Similar Essays

Evolution And Natural Selection Essay

620 words - 2 pages 1. Types of selection: Artificial vs. natural Modes of selection2. Examples of selection: Evolution by pollution Evolution in agricultureAdaptive significance of heterostyly1. Although natural selection is the dominant force shaping the course of evolution, it is a complicated process and a difficult one to quantify. Most of the phenotypic characters we associate with a particular species and use in their classification, e.g. body coloration in

Natural Selection, Scale, And Cultural Evolution

985 words - 4 pages explain evolution in cultural anthropology and archaeology rather than cultural evolution. The main problem with biological evolution is the dilemma of altruistic behavior in humans, which is the exact opposite of natural selection. Dunnell states that altruistic behavior is “the ultimate of the selfish principles” (Dunnell 1996: 26). The original solution to the issue of altruistic behavior was thought to be to change the scale of which natural

Natural Selection, Scale, And Cultural Evolution

956 words - 4 pages In his article entitled “Natural Selection, Scale, and Cultural Evolution” Dunnell states that his purpose for the paper is to explain why evolution has made such a small impact on archaeology. His hopes, he says, are to give ways to integrate evolutionary characteristics and anthropological theory effectively. He first explains that cultural evolution and biological evolution are not the same (1996, pg 24). Because its “laws are not

Evolution And Charles Darwin´S Natural Selection

830 words - 4 pages the fact of where we came from, or at least, science's theory about it. Darwin's theory of natural selection is a very big part of evolution, showing the gradual adaptation of characteristics in species. Natural selection is the gift of new beneficial adaptations to animals of a species, for the purpose of survival. The good traits are kept through the survival and reproduction of animals with the traits. The bad traits will be eliminated