Question

XO sex determination is seen in ____________.

• A. Man
• B. Drosophila
• C. Birds
• D. Grasshopper
• E. Horse

Answer 1

The correct option is D Grasshopper

• In organisms like crickets, grasshoppers, and some other insects, the female is XX and is the homogametic sex. The male is the heterogametic sex but only has one sex chromosome. The male in XX-XO systems produces gametes with (X) or without (O) a sex chromosome.
• Man and Drosophila have XX-XY sex determination system.
• Birds have a ZW sex-determination system.
• A mare has two identical chromosomes X and is XX and a stallion has one X and one Y chromosome so is XY (Y being the male chromosome).

So, the correct answer is 'Grasshopper'.