Select the group which shares maximum number of common characters

Options

A. two individuals of a species
B. two genera of a family
C. two species of a genus
D. two genera of two families

Explanation

To solve the question of selecting the group that shares the maximum number of common characters, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification Hierarchy**:
- The biological classification system is hierarchical. It starts from broad categories and narrows down to specific ones. The major levels in this hierarchy are: Kingdom, Phylum (or Division), Class, Order, Family, Genus, and Species.

2. **Identify the Lowest Taxon**:
- Among these levels, the lowest taxon is the species. Members of the same species share the most characteristics because they are closely related.

3. **Compare Different Groups**:
- The question provides options that include:
- 2 individuals of a species
- 2 species of a genus
- 2 genera of a family
- 2 genera of 2 families
- We need to analyze which of these groups would share the most common characteristics.

4. **Evaluate Each Option**:
- **2 individuals of a species**: These will share the maximum number of common characteristics because they belong to the same species.
- **2 species of a genus**: While they share some characteristics, they will have fewer common traits than two individuals of the same species.
- **2 genera of a family**: They will share even fewer characteristics than two species of a genus.
- **2 genera of 2 families**: This group will share the least number of common characteristics.

5. **Conclusion**:
- Based on the analysis, the group that shares the maximum number of common characteristics is **2 individuals of a species**. Therefore, the correct answer is option A.

### Final Answer:
- The group that shares the maximum number of common characters is **2 individuals of a species** (Option A).