Phenetic classification is based on

Options

A. Ancestral lineage
B. Observable characteristics of existing organisms
C. Sexual characteristics of existing organisms
D. Dendrograms of DNA characteristics

Answer

**Step-by-Step Solution:**

1. **Understanding Phenetic Classification**:
- Phenetic classification is a method of classifying organisms based on observable characteristics and overall similarities rather than evolutionary relationships.

2. **Basis of Classification**:
- The classification is primarily based on measurable traits that can be observed. These traits are usually morphological (physical characteristics) rather than anatomical (internal structures).

3. **Exclusion of Evolutionary Relationships**:
- In phenetic classification, priority is not given to phylogeny (evolutionary history) or genetic makeup. This means that the classification does not consider how organisms are related through evolution.

4. **Observable Characteristics**:
- The classification focuses on observable characteristics of existing organisms. This includes traits that can be measured and compared across different organisms.

5. **Conclusion**:
- Therefore, phenetic classification is based on overall similarities, particularly observable characteristics, without considering evolutionary relationships.

**Final Answer**: Phenetic classification is based on overall similarities, particularly observable characteristics of organisms.

---