Question

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

• A. Male
• B. Female
• C. Superfemale
• D. Intersex

Answer 1

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.
$\begin{array}{ccc}\text{Chromosome formulation}& \text{Ratio of X chromosomes}& \text{Sexual morphology}\\ & \text{to autosome sets}& \\ 3X/2A& 1.5& \text{Metafemale}\\ 3X/3A& 1.0& \text{Female}\\ 2X/2A& 1.0& \text{Female}\\ 3X/4A& 0.75& \text{Intersex}\\ 2X/3A& 0.67& \text{Intersex}\\ XO/2A& 0.50& \text{Male}\\ XY/2A& 0.50& \text{Male}\\ XY/3A& 0.33& \text{Metamale}\end{array}$