EVOLUTION
MODERN THEORY OF EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Believed by Jean Baptiste
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More you use it, the weaker it is
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Less you use it, the weaker it is
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Detailed explanation-1: -Lamarck on use and disuse. reflect that the infinitely diversified but slowly changing environment in which the animals of each race have successively been placed, has involved each of them in new needs and corresponding alterations in their habits. This is a truth which, once recognised, cannot be disputed.
Detailed explanation-2: -work of Lamarck He enunciated the law of use and disuse, which states that when certain organs become specially developed as a result of some environmental need, then that state of development is hereditary and can be passed on to progeny.
Detailed explanation-3: -According to Lamarck, new needs (besoins) arise in animals as a result of a change in the environment. This leads to new types of behaviour involving new uses of pre-existing organs. Their use leads to an increase in size or to other methods of functioning. Conversely, the disuse of other parts leads to their decline.
Detailed explanation-4: -Lamarckism is considered as a wrong concept because the characters acquired by an organism during its lifetime due to use or disuse do not affect the genetic makeup of the organism. They are simply phenotypic changes.