Genic balance theory holds good in case of.

Humans

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Drosophila

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Grasshopper

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Allium cepa

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Solution

The correct option is B Drosophila
The theory of genic balance given by Calvin Bridges (1926) states that instead of XY chromosomes, sex is determined by the genic balance or ratio between X-chromosomes and autosome genomes. The theory is basically applicable to Drosophila melanogaster over which Bridges worked.

So, the correct answer is 'Drosophila'.

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