Question

Explain Lamarckism in short.hey exploderwave answer my question......

Answer 1

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♥Use and disuse in the evolution of the neck of the giraffe. The classic example used to explain the concept of use and disuse is the elongated neck of the giraffe. According to Lamarck's theory, a given giraffe could, over a lifetime of straining to reach high branches, develop an elongated neck ...♥

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 :-

• Evolution of giraffe
• Cave Dwellers
• Flightless Birds
• Extinction of Limbs in Snakes
• Aquatic Birds with Webbed Toes

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