Describe Darwin's theory of natural selection .State the objections raised against this theory.
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drawin theory of natural selection gave the following postulates
The ability of a population to expand is infinite, while the resources available to sustain said population are finite. This dynamic causes a struggle for existence among individuals as they compete for resources.
Organisms vary in their physical qualities; these variations allow some members to reproduce more successfully than others.
These variations are inherited by offspring from their parents.
Objection raised against theory:
When all was said and done, evolution by natural selection seemed to be a plausible explanation of the wide variation and diversity both between and among organisms. However, the theory remained controversial because variation, and its inheritance, could not be adequately explained in terms of the existing body of knowledge. The current of the times favored a blending mode of inheritance, which would effectively deplete a population of organisms of all variation.
Darwin could not provide a counterargument to the question of blending inheritance during his lifetime. At first glance, blending seems to be a good theory. Do not many human children appear to look like both their mother and father? Though blending would have grave implications for any evolutionary novelty or variation; descendants would merely become increasingly homogenized with each passing generation. However, as Gregor Mendel would point out, while phenotypic variation may indicate blending of sorts, the inherited material—namely the genes—remains discrete.
The ability of a population to expand is infinite, while the resources available to sustain said population are finite. This dynamic causes a struggle for existence among individuals as they compete for resources.
Organisms vary in their physical qualities; these variations allow some members to reproduce more successfully than others.
These variations are inherited by offspring from their parents.
Objection raised against theory:
When all was said and done, evolution by natural selection seemed to be a plausible explanation of the wide variation and diversity both between and among organisms. However, the theory remained controversial because variation, and its inheritance, could not be adequately explained in terms of the existing body of knowledge. The current of the times favored a blending mode of inheritance, which would effectively deplete a population of organisms of all variation.
Darwin could not provide a counterargument to the question of blending inheritance during his lifetime. At first glance, blending seems to be a good theory. Do not many human children appear to look like both their mother and father? Though blending would have grave implications for any evolutionary novelty or variation; descendants would merely become increasingly homogenized with each passing generation. However, as Gregor Mendel would point out, while phenotypic variation may indicate blending of sorts, the inherited material—namely the genes—remains discrete.
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Natural selection by Darwin's theory is described below :
i) This theory stated that evolution of lives occurs gradually and then various forms of life arises at the different history periods.
ii) Natural selection results in the production of new type of species.
iii) Variations occurs in the characters of all organisms. This helps them to survive well in natural environment.
Objections are :
1. Darwin did not concern on the hereditary principles.
2. It did not explain about the arrival of fittest.
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