Question

XX-XO type of sex determination is found in ____________.

• A. hens
• B. Drosophila
• C. parrots
• D. grasshoppers

Answer 1

The correct option is D

Explanation of the correct option

1. Grasshoppers have an XX-XO sex-determination system. Males only have one X chromosome (XO), while females have two (XX).
2. In hens and parrots: the ZW-ZZ system is found, and the ovum determines the sex of the offspring. Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW).
3. Drosophila has an XX-XY sex-determination system. Males have XY and females have XX chromosomes.
   

Final Answer: XX-XO type of sex determination is found in grasshoppers.