Karyotaxonomy is the modern branch of classification which is based on

Options

A. Number of chromosomes
B. Bands found on chromosomes
C. Organic Evolution
D. Trinomial Nomenclature

Answer

**Step-by-Step Solution:**

1. **Understanding Karyotaxonomy**: Karyotaxonomy is a branch of taxonomy that focuses on the classification of organisms based on their chromosomal characteristics. The term "karyo" refers to the nucleus, which contains chromosomes.

2. **Key Features of Karyotaxonomy**: This classification method considers several factors related to chromosomes:
- The number of chromosomes present in an organism.
- The structure of the chromosomes, which includes the arrangement of genes and the presence of specific bands on the chromosomes.
- The size and shape of the chromosomes.

3. **Analyzing the Options**: The question provides multiple-choice answers regarding what karyotaxonomy is based on:
- Number of chromosomes
- Bands found in the chromosomes
- Organic evolution
- Trinomial nomenclature

4. **Identifying the Correct Answer**: While karyotaxonomy does consider the number of chromosomes, it primarily focuses on the bands found in the chromosomes. These bands are crucial for distinguishing between different species and understanding their evolutionary relationships.

5. **Conclusion**: Therefore, the correct answer to the question is that karyotaxonomy is based on the bands found in the chromosomes.

---