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Brief Essay on the Darwin’s Theory of Natural Selection

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❶The immense power of reproduction ensures a competition among the offsprings for food, shelter clothing light mating partner and all other necessities of life.

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Introduction

The differences of offsprings from their same species are called variations. These are the most important aspects of evolution. No two individuals were exactly alike. Such variations were of two kinds, some were inheritable while others were not inheritable. Darwin was not aware of the principles of heredity and hence could not explain satisfactory the causes of such variation. Further, the variation may be beneficial, harmful or neutral. The beneficial variations help the organisms to survive while the harmful variations hinder and handicap the organisms for survival.

Neutral variations have no role in evolution. The organisms with useful variations have an upper hand in the struggle for existence and they come out successful.

They win the struggle, survive and propagate the variation to the next generation. Others with harmful variations perish, while variations give rise to new characters, heredity passes them to the next generation. According to Darwin nature selects the fittest ones to survive and rejects the unfit ones as a former selects the seeds for the next year's crop artificially. In nature, only those organisms which are best adapted to a given set of conditions are most likely to survive.

Due to natural selection the organisms with better suitable characters get more chances of reproduction and these with less advantage characters get less chance. In this way, in species advantageous characters are increasingly accumulation generation after generation and disadvantageous characters gradually disappear. In spite of its world wide acceptance, Darwin's theory has been subjected to certain objections.

The theory explains only the survival of the fittest but not the arrival of the fittest. Darwin believed in inheritance of acquired characters which has not been proved by genetics. Darwin did not accept the discourteous or mutations as the basis of evolution. Our quality does not depend on the type of essay topics and thus, you do not have to worry, if the topic suits our style or not. Theory of Natural Selection Paper Writing Educated professionals mostly relate to natural selection paper.

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Comparison of DNA sequences between human beings and apes reveal a close genetic similarity. This reveals that these two species probably had a common ancestor Starr, Taggart, and Starr p, Natural selection also gives an account of the great diversity that is displayed by modern species.

Organisms that have distinct traits that enable them to live in environmental niches not occupied by similar organisms, according to Starr, Taggart and Starr, possess a greater chance of surviving p, Over generations, species which originated from a common ancestor have diversified in addition to occupying more and more environmental niches in order to take advantage of unutilized resources.

Modern species are a phase in the progression of evolution, and their diversity results in the development of a series of speciation as well as extinction. Diversity of life, according to Gulick, does not result in development of a completely new and unique organism, but rather in organisms that share certain morphological similarities p, Vestigial characteristics that have no specific role resemble functional ancestral characteristics, and as a result, organisms can be categorized using these similarities into a ladder of connected groups.

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Sexual Selection and Natural Selection - Selection is the functional relationship between phenotypes and fitness. Natural selection is the production of organisms according to their physical attributes whereby off springs of the younger generations takes the strong, desired and inheritable aspects of .

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This paper gives an explanation of Darwin's theory of natural selection. As well, the paper fully gives a description of natural selection in terms of "modern evolutionary synthesis" of the 20th century. The paper also gives application of the principles of natural selection to explain the current problem of antibiotics resistance in bacteria.

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On the basis of these objections and other scientific researches it can be said that natural selection is not the only chief cause of evolution. Darwin himself said that, "The natural selection is an important cause of variation but not its sole reason. Natural Selection and Patterns of Evolution Worksheet Essay Associate Level Material Appendix F Natural Selection and Patterns of Evolution Worksheet Complete the worksheet writing to word short answers for each question.

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