Conclusion of Lamarckism

Conclusion of Lamarckism:- Lamarckism is an such not wrong but it is incomplete because Lamarck was unaware of genetic factor is responsible for the inheritance of acquired character. Genetics was developed only after 1900AD, which was long after the Lamarckism (1809-1811) AD.
Darwinism
This theory is given by English naturalist Sir Charles Darwin. He did extensive study of nature for more than 25 years and developed a theory known as ‘Theory of natural selection’. This theory was later called ‘Darwinism’ in his honor. Charles Darwin wrote a book ‘Origin of species’ in 1859 AD, in which all his observation explanations are included. His theory gives 7 different assumptions. They are:-
Assumption Consequences
Over production
Survival number constant
Struggle for existence Natural selection or survival of the fittest
Variations and heredity
Natural selection
Environmental change
Origin of species
1. Over production
Any organism have very high capacity to produce large number of off springs, this capacity is called ‘Biotic potential.’ Example:-
Male house fly Female house fly
120 eggs -7batches
60m 60f
More than 50 trillion

Example:-
Elephant (70 to 80 years longevity)
30 years (start giving birth)
5-7 young
After 900 years, the number of elephant will be 150 million
2. Survival number constant:-
However the number of survival is not increase but remaining same or constant.
3. Struggle for existence
Though large number of off springs produced by all the living organisms most of them will die due to starvation, lack of space. As food supply is limited and space is constant, there will be tough competition among the numbers of same or different species to exploit limited resources. So there is two type of competition.
Intraspecific competition:- It is the competition among the number of same species.
Inter specific competition:- It is the competition among the number of different species.
Besides competition, members of living organisms also die due to predation, parasitism, diseases etc. Predation is a common feature toward among animals. Predation also, controls the population. Different ecto and endo parasites and different micro-organisms like virus, bacteria, fungi cause different dieses in poor fed population to control their number.
4. Heredity and variation
Variation:- Though most of organisms will dies; some members will surve who have good variations (charge or qualities),
Variations are three types
Meristic and substantiative
Continuous and discontinuous
Somatic and germinal
Meristic and substatiative
Meristic:- It is the change in number of parts of body. For example:- change in number of toes arms etc.
Substantiative:- It is the change in morphological feature like coloration, shape and size etc.
Continuous and discontinuous:-
Continuous:- It is slow, gradual but continuous change. The slow change shown by living organism with the change in environment and habit is continuous change.
Discontinuous:- It is fast or abrupt change occurring occasionally just like mutation.
Somatic and germinal:-
Somatic:- It is the change in somatic cell which does not take part in reproduction. So this change is not inherited to next generation. Example:- development muscle of wrestler. Small feet of Chinese woman etc.
Germinal:- It is the change in reproductive cells which is inherited to next generation. Somatic change may influence the germinal and the change is inherited to next generation.
Heredity:- All the variation should influence the germinal cell or chromosome (DNA) and it inherited the change in next generation, it is called heredity.
5. Natural selection
The organisms with good qualities; change/variations are selected by natural. This is called ‘Natural selection’. Here, organism must have best variations. So that it can complete or struggle for existence. Therefore, natural selection is in other word also called ‘Survival of the fitted’. The theory of Darwinsm is based on ‘Natural selection’. Therefore darwinsm is also called ‘Theory of natural selection’
Environmental change
Evolution is a phenomenon of long time during which, condition of earth is also changes. There was a great ‘Tethis sea’ in the place of ‘Great Himalays’. Forest land, grass land, deserts are continently changed in the course of long run. Similarly, earth was covered completely by ice during glacial period, Earthquake, volcanoes, strums change the geography of earth that is Tsunami.
Origin of species
Constant struggle for survival along with struggle to adjust in the changing environment of earth, the living organisms have developed many changes in then the established as new species. This is called ‘Origin of Species.’
The earth was earlier 2 great continents which collided with each other and form present 7 different continents and this is explained by ‘Drief continental change’.