Karyotype is

Options

A. Division of nucleus
B. Chromosome complement specific for each species
C. All organisms possessing some type of chromosomes
D. None of the above

Answer

### Step-by-Step Text Solution:

1. **Understanding Karyotype**:
- A karyotype refers to the complete set of chromosomes in an individual organism. It is a way to visualize and categorize the chromosomes based on their number, size, and shape.

2. **Definition of Karyotype**:
- Karyotype can be defined as the chromosomal characteristic of a cell, which includes the number and appearance of chromosomes.

3. **Analyzing the Options**:
- **Option A**: Division of nucleus - This is incorrect. The process of nuclear division is known as karyokinesis.
- **Option B**: Chromosome complement specific for each species - This is correct. Each species has a specific number of chromosomes that make up its karyotype. For example, humans have 46 chromosomes.
- **Option C**: All organisms possessing some type of chromosomes - This is misleading because while all organisms have chromosomes, they do not all possess the same type or number of chromosomes.
- **Option D**: None of the above - This is incorrect since option B is a valid definition.

4. **Conclusion**:
- The correct answer is **Option B**: Chromosome complement specific for each species.