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(B) The $Genic$ $balance$ $theory$ of sex determination was proposed by $C.B.$ $Bridges$ in $Drosophila$ $melanogaster$.According to this theory,the s

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Genic balance theory of sex determination

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(B) The $Genic$ $balance$ $theory$ of sex determination was proposed by $C.B.$ $Bridges$ in $Drosophila$ $melanogaster$.According to this theory,the sex of an individual is determined by the ratio of the number of $X$-chromosomes $(X)$ to the number of sets of autosomes $(A)$.This ratio is expressed as $X/A$ ratio.If the $X/A$ ratio is $1.0$,the individual is a female; if it is $0.5$,the individual is a male; and if it is between $0.5$ and $1.0$,it is an intersex.

The theory where the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is known as:

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