Question

XO type of sex determination can be found in

• A. Drosophila
• B. Birds
• C. Grasshoppers
• D. Monkeys

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Sex determination mechanisms vary across species. In some, it is based on the presence of specific sex chromosomes.
Detailed Explanation:
- Grasshoppers (XO type): Males have only one X chromosome (XO) and produce two types of sperms (50% with X, 50% with none). Females have two X chromosomes (XX). This is a male heterogamety system.
- {Drosophila (XY type):} Similar to humans, males are XY and females are XX.
- Birds (ZW type): Females are heterogametic (ZW) and males are homogametic (ZZ).
- Monkeys (XY type): As mammals, they follow the XY system.
Step 2: Final Answer:
XO type sex determination is characteristic of insects like grasshoppers.