Who discovered X-chromosome during spermatogenesis in few insects and initially named it X body ?

Answer

**Step-by-Step Solution:**

1. **Identify the Scientist**: The question asks for the name of the scientist who discovered the X-chromosome during spermatogenesis in certain insects and initially referred to it as the X body.

2. **Recall Historical Context**: This discovery occurred in the late 1800s, specifically in 1891, which is important for understanding the timeline of genetics.

3. **Examine the Research Focus**: The scientist in question, Hermann Henking, conducted research on the gonads of insects, particularly focusing on the process of spermatogenesis.

4. **Describe the Observation**: During his cytological studies, Henking observed that in the process of meiosis (which produces sperm), there were 11 distinct chromosomes. However, he noted that in half of the sperm cells, there was an additional structure present.

5. **Naming the Structure**: This additional structure, which was observed in some sperm but not in others, was named the X body by Henking.

6. **Understanding the Significance**: Although at the time the importance of this structure in sex determination was not fully understood, it later became recognized as the X chromosome, which plays a crucial role in determining the sex of the organism.

7. **Conclusion**: Thus, the answer to the question is Hermann Henking, a German scientist who discovered the X chromosome in insects during spermatogenesis and initially named it the X body in 1891.

**Final Answer**: Hermann Henking

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