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(B) Hugo de Vries proposed the mutation theory based on his work on the evening primrose $(Oenothera \, lamarckiana)$.He believed that evolution is a

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Hugo de Vries

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(B) Hugo de Vries proposed the mutation theory based on his work on the evening primrose $(Oenothera \, lamarckiana)$.He believed that evolution is a saltatory process, meaning it occurs through large, sudden, and heritable variations called mutations.Unlike Darwin's theory of gradual accumulation of small variations, de Vries emphasized that mutations are the primary cause of evolution.

Who proposed the idea of mutations based on his work on plants?

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An elephant produces six young ones in its life span of $100$ years. If this continues,then,in $750$ years,$19$ million elephants will be produced. It is $NOT$ possible in reality mainly due to . . . . . . .

$A$: Mutations are non-directional.
$R$: Darwin's small variations are directional.

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