If the sex-determining ratio given by X chromosome by autosome(X/A) is 0.5 in Drosophila, then sex will be:

Male

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Female

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Superfemale

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Intersex

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Solution

The correct option is A Male
If the sex-determining ratio is given by X chromosome by autosome(X/A) is 0.5, then its a male.
$\begin{matrix} Chromosome formulation & Ratio of X chromosomes & Sexual morphology to autosome sets 3 X / 2 A & 1.5 & Metafemale 3 X / 3 A & 1.0 & Female 2 X / 2 A & 1.0 & Female 3 X / 4 A & 0.75 & Intersex 2 X / 3 A & 0.67 & Intersex X O / 2 A & 0.50 & Male X Y / 2 A & 0.50 & Male X Y / 3 A & 0.33 & Metamale \end{matrix}$

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