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(B) The Genic Balance Theory of sex determination was proposed by $C.B. Bridges$ in $1921$ based on his studies on $Drosophila$ $melanogaster$.Accordi

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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 $1921$ based on his studies on $Drosophila$ $melanogaster$.According to this theory,the sex of an individual is determined by the ratio of the number of $X$-chromosomes to the number of sets of autosomes $(A)$.This ratio is expressed as $Ratio = X/A$.If the ratio is $1.0$,the individual is a female; if the ratio is $0.5$,the individual is a male; and if the ratio is between $0.5$ and $1.0$,it results in an intersex individual.

The theory in which the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is called ....

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