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Jean Baptiste Lamarck presented theories on Lamarckism.

Introduction to Lamarck’s Theory of Evolution Lamarckism has covered a broad spectrum of theoretical positions on the nature of evolution. Jean Baptiste Lamarck presented theories on Lamarckism.  There were numerous explanations given from the 18th century until the early 20th century.  Lamarckism is about the succession of life forms, their history, their transformations. Darwin believed that individuals were simply born with different traits and these differences were mostly random. This theory was contrary to Lamarck who said that traits could develop change during an animal’s life. The theory is. based on evolution stated that physical changes in organisms during their life-likee, in a part through increased use or greater development of organs could be transmitted to their offspring. Inheritance of Acquired Characteristics  Characteristics that have been developed by an individual in the course of their life in the body or somatic cells are usually through the use or disuse of part or an immediate reaction to some external modification in the environment. The reappearance of variations from an individual in the next or succeeding generations is known as the inheritance of acquired characteristics. Inheritance of a change can be explained through an example of Blacksmith’s arm. When the arm is used continuously against an external resistance like the weight of the hammer then blacksmith’s arm enlarges. At the birth, the smith’s children would have unusually large arms,  if the effect were inherited. Theory of Use and Disuse Lamarck tried to explain the evolutionary process in his book Philosophic Zoologique. The use and disuse of an organ lead to acquiring changes in the feature of the organ. These changes are also inherited to offspring. ButLamarckismm was very strongly criticized by August Weismann. Lamark’s Theory of Inheritance of Acquired Characteristics The first theory of evolution is Lamarckism which was proposed by a French biologist. It states that modifications acquired by an organism during its lifetime are automatically handed down to its descendants, and so it becomes part of heredity. His evolution ideas are briefed as follows:

The internal forces of life tend to increase continuously the size of an organism and its components.

The organs of an animal show modifications in a way that they respond directly to a changing environment. 3.Use of Disuse More use of organs greatly improves them and misuse reduces the organs.

It is the direct transmission of those superficial bodily changes that arose within the lifetime of an individual. Examples of Lamarckism  Lamarckism explained his theory by giving the following examples

[Image will be Uploaded Soon] Drawbacks in Lamarckism

1.Compare Lamarck and Darwin Theories of Evolution Difference between Lamarckism and Darwinism is as follows: Lamarckism

2.Explain Darwin’s Theory of Natural Selection Charles Darwin the Naturalist stated in his theory of natural selection that all species of organisms arise and develop small inherited variations that increase the individual’s ability to compete, survive, and reproduce. The theory has two main points, in which he has explained that all life forms on Earth are related to each other. The diversity in life forms is the result of modifications in populations and due to the process of natural selection. Due to natural selection, some traits could be favored in an environment and others couldn’t be favored. The theory is well known as “ Survival of the fittest ones”. It can be misleading so popular referred fitness not to an organism’s strength or athletic ability but the ability to survive and reproduce.

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