Question

explain lamarck's theory of evolution with examples​

Answer 1

Answer:

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

According to the Lamarckism, 'the changes in structure or functions of any organ  acquired during the lifetime of an individual In response to changes in the surrounding environment are inherited by its off springs and keep on adding up over a period of time'.

• Changes in the environment create new needs in living organisms so that they are better adapted to the changed environment.
• New characters are acquired by the living beings either due to use and disuse or by the effect of environment.
• The characters acquired by an organism during its lifetime are inherited to the next generation.
• For example, according to Lamarck, giraffes had short neck and four limbs and grazed on grass.
• As grasslands were replaced by a few high trees, the leaves of these high trees were the only food available to the ancestors of Giraffe.
• The continuous stretching of next to reach the tree leaves resulted in gradual elongation of neck and forelimbs.
• This change was transmitted to the next generation.