Question

Who discovered lamarckism

Answer 1

Answer:

JEAN BABTISTE LAMARCK.....

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Answer 2

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✒ Lamarckism

• Lamarckism was proposed by Jean-Baptiste de Monet Lamarck in the year 1744-1829.
• This theory was based on the principle that all the physical changes occurring in an individual during its lifetime are inherited by its offspring.
• For eg, the development of an organ when used many times.
• This theory has been explained here.

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✒ Lamarck’s Theory

☞ Lamarck’s theory includes four main propositions :-

1. Change Through Use And Disuse

• The organs which are used frequently by the organism develop and the characteristics that are used seldom are lost in the succeeding generations.

2. Organisms Driven To Greater Complexity

• As the organisms adapted to their surroundings, they became increasingly complex from the simpler forms.
• Lamarck believed in the spontaneous generation of life.

3. Inheritance of Acquired Characters

• An individual acquires certain characteristics during its lifetime.
• These characters are inherited by their offspring as well.
• He explained this with an example of a blacksmith.

4. Effect of Environment and New Needs

• The environment influences all the organisms.
• A slight change in the environment brings about changes in the organisms.

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✒ Examples of Lamarckism

Few of the examples of Lamarckism are mentioned below :-

1. Evolution of giraffe
2. Cave Dwellers
3. Flightless Birds
4. Extinction of Limbs in Snakes
5. Aquatic Birds with Webbed Toes

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