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(B) In $Drosophila$,sex determination is based on the genic balance theory proposed by $C.B. Bridges$.According to this theory,the sex of an individua

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The ratio of number of $X$-chromosomes to the sets of autosomes

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(B) In $Drosophila$,sex determination is based on the genic balance theory proposed by $C.B. Bridges$.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 known as the sex index ratio $(X/A)$.For example,in a superfemale,the number of $X$-chromosomes is $3$ and the number of sets of autosomes is $2$,resulting in a ratio of $3/2 = 1.5$.

In $Drosophila$,the sex is determined by

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