1.Species is defined as a group of similar organism that can interbreed. This is a biggest gene pool that can exchange genes. When species exchange genes and breed with each other they produce fertile offspring.
2.population is defined as a group of organisms of the same species occupying a particular area that live together. The ultimate constituents of population are individual organisms that can potentially interbreed.
3. Genetic variation is very important in evolution process. Mutation, random mating, and recombination cause it. Variation allows changing in genetic pool in a population. Genetic variation enables an organism to better adapt to their climate or environment and so increase the chance to survive in new environment.
4. Genetic …show more content…
With so many variations in populations of species, the struggle of existence results in 'survival of the fittest', a term coined by Herbert Spencer.
The survival of fittest is a direct result of the selection and proliferation of only those organisms which were most suitable adapted to the environment and most successful in mating.
The major achievement of Darwin was to recognize one of the major factors in adaptation i.e. Natural selection. However Darwin was not clear about the sources of variations and the mechanism involved in natural selection.
For instance, Darwin thought the natural selection operates through death of unfit rather than through differential reproduction. Further, he thought that the natural selection operates on variations already available and did not consider the possibility of origin of new hereditary variations. In fact, Darwin thought only the possibility of the survival of the fittest and could not see the possibility of the arrival of the fittest.
Mutation theory proposed by De Vries is an important concept, as it states that a fully formed useful character may appear due to mutation in one single
2.population is defined as a group of organisms of the same species occupying a particular area that live together. The ultimate constituents of population are individual organisms that can potentially interbreed.
3. Genetic variation is very important in evolution process. Mutation, random mating, and recombination cause it. Variation allows changing in genetic pool in a population. Genetic variation enables an organism to better adapt to their climate or environment and so increase the chance to survive in new environment.
4. Genetic …show more content…
With so many variations in populations of species, the struggle of existence results in 'survival of the fittest', a term coined by Herbert Spencer.
The survival of fittest is a direct result of the selection and proliferation of only those organisms which were most suitable adapted to the environment and most successful in mating.
The major achievement of Darwin was to recognize one of the major factors in adaptation i.e. Natural selection. However Darwin was not clear about the sources of variations and the mechanism involved in natural selection.
For instance, Darwin thought the natural selection operates through death of unfit rather than through differential reproduction. Further, he thought that the natural selection operates on variations already available and did not consider the possibility of origin of new hereditary variations. In fact, Darwin thought only the possibility of the survival of the fittest and could not see the possibility of the arrival of the fittest.
Mutation theory proposed by De Vries is an important concept, as it states that a fully formed useful character may appear due to mutation in one single