Theory proposed by Bridges is

Sex reversal

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Hormonal control of sex

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Genic balance

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Development of gynandromorph

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Solution

The correct option is D Genic balance
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.

So, the correct answer is 'Genic balance'.

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