Question

explain lamarkism? ​

Answer 1

THE CHARACTERS DEVELOPED DURING THE LIFE TIME OF ORGANISMS ARE CALLED ACQUIRED CHARACTERS .LAMARCK EXPLAINED THAT THESE CHARACTERS ACCUMULATE THROUGH GENERATIONS AND LEAD TO THE FORMATION OF NEW SPECIES.ACCORDING TO LAMARCK GIRAFFES HAD SHORT NECK IN THE BEGINNING.WHEN THEY FACED FOOD SCARCITY ,THEY STRETCHED THIER NECKS TO REACH OUT TALL TREES.BUT THIS ARGUMENT WAS NOT ACCEPTED BY THE SCIENTIFIC WORLD AS THESE ACQUIRED CHARACTERS ARE NOT INHERITABLE.

Answer 2

$\huge{\underline{\tt{\green{Answer-}}}}$

First theory of evolution, proposed by lamarck in 1809. it states that the characteristics that acquired by organisms during their lifetime in response to environmental conditions are passed onto their off springs

$\huge{\underline{\tt{\green{Basic\:Concepts-}}}}$

1) Internal vital force give organism thew the energy to increase the size of its or organ.

2) Effect of environment and new need to produce new structure and changes habits of the organism.

3) Use and disuse of organs if organ is disused, it leads to its degeneration.

4) Inheritance of acquired character during the life time organism, new character develops.

${\underline{\tt{\green{Example-}}}}$Long neck and high forelimb of giraffe, snake etc.

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