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(D) The experiment described is famously associated with August Weismann. By keeping Drosophila in the dark for $69$ generations,the scientist tested

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Inheritance of acquired characters

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(D) The experiment described is famously associated with August Weismann. By keeping Drosophila in the dark for $69$ generations,the scientist tested the Lamarckian hypothesis of the 'Inheritance of acquired characters'. According to Lamarck,if an organ is not used,it gradually disappears or weakens over generations,and these acquired changes are passed to offspring. Since the flies still possessed normal eyes after $69$ generations,it proved that the lack of use did not lead to the loss of the trait,thereby disproving the theory of the 'Inheritance of acquired characters'.

$A$ scientist kept $69$ generations of Drosophila in the dark,yet the flies still had normal eyes. Which theory does this disprove?

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