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The Sxl gene is turned ____________ by a ratio of _____________for X:A.

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The Sxl gene is turned ____________ by a ratio of _____________for X:A.

(a) OFF, 1

(b) OFF, 0.5

(c) ON, 0.5

(d) ON, 0.75

I got this question in exam.

This is a very interesting question from Sex Determination in Drosophila topic in chapter Chromosomes and Sex Determination of Cytogenetics

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The correct choice is (b) OFF, 0.5

Explanation: The Sxl gene is turned ON only when the ratio of X:A is 1, other times it is OFF. An OFF state produces a male while on state produces a female.

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