Second Law of Lamarckism or Proposition:
‘When an organism is ‘in need’ of an organ, sooner or afterward it will occur.’
This view of Lamarck emphasized the importance of mind and its thinking being associated to needs in an atmosphere. Therefore, according to Lamarck a constant thinking for numerous generations can lead to the origin of an adaptive character. Lamarck explained his view citing the lengthening of neck in giraffe over the years.
Figure: Lamarck’s TheoryIt is acknowledged via fossil records that the ancestors of modern giraffe were small and they had small neck and forelimbs. They reside in the grasslands of Africa. Such ancestral animals were feeding on grasses and the leaves of small trees close by. Gradually, as the grasslands were changed into deserts, the animals became reliant on trees for food.
Due to competition for food they had to extend their neck for more leaves. They strained their neck for numerous generations with a very strong interior feeling to have longer neck. This strong wish, in course of time, led to steady raise in the length of neck and forelimbs.
In this elucidation Lamarck considered that mere ‘want’ or ‘internal feeling’ to possess a specific character can lead to the origin of such a character. This view of Lamarck is not adopted by modern evolutionists.
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