All the species of a genus possess same

Options

A. Ancestry
B. Karyotype
C. Anatomy
D. Genetics

Answer

To solve the question "All the species of a genus possess the same," we will analyze the options provided and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what all species within a genus have in common.

2. **Analyzing the Options**:
- **Option A: Ancestry**: This refers to the common lineage or evolutionary history shared by species. Species within a genus are grouped based on shared ancestry.
- **Option B: Karyotype**: This is the number and appearance of chromosomes in the nucleus of a cell. Each species has a unique karyotype, so this cannot be the correct answer.
- **Option C: Anatomy**: This refers to the physical structure of organisms. While species within a genus may share some anatomical features, they can also have significant differences, so this option is not correct.
- **Option D: Genetics**: This pertains to the genetic makeup of organisms. Each species has its own unique genetic composition, which means they cannot share the same genetics.

3. **Eliminating Incorrect Options**:
- Karyotype (B) is unique to each species.
- Anatomy (C) varies between species.
- Genetics (D) is different for each species.

4. **Identifying the Correct Answer**:
- The only option that remains is **Ancestry (A)**. All species of a genus share a common ancestry, which is the basis for their classification into the same genus.

5. **Conclusion**: Therefore, the correct answer is **A: Ancestry**.