Choose the incorrect statement.

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(D) The correct answer is $D$. $T.H.$ Morgan and his colleagues performed experimental verification of the chromosomal theory of inheritance using $Dr

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$Drosophila$ $melanogaster$ has few types of hereditary variations that can be seen with a low-power microscope.

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(D) The correct answer is $D$. $T.H.$ Morgan and his colleagues performed experimental verification of the chromosomal theory of inheritance using $Drosophila$ $melanogaster$ (fruit flies). These flies were chosen because they could be grown on simple synthetic media in the laboratory,their life cycle is short (about two weeks),and a single mating could produce a large number of progeny. Furthermore,they exhibit many types of hereditary variations that can be seen with low-power microscopes,not 'few' types. Therefore,statement $D$ is incorrect.

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