Presence of whole sets of chromosomes is called …………. .

Options

A. aneuploidy
B. ploidy
C. euploidy
D. chromatography

Answer

To solve the question "Presence of whole sets of chromosomes is called ………….," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the presence of whole sets of chromosomes in an organism.

2. **Evaluating the Options**:
- **Option A: Aneuploidy**: This term refers to a condition where there is an abnormal number of chromosomes, specifically when one or more chromosomes are missing or extra. This does not represent the presence of a complete set of chromosomes.
- **Option B: Ploidy**: This term refers to the number of sets of chromosomes in a cell. It can be haploid (one set), diploid (two sets), triploid (three sets), etc. This term is used to describe the complete sets of chromosomes present.
- **Option C: Cuploidy**: This term does not exist in the context of genetics and is likely a distractor.
- **Option D: Dichromatography**: This is a technique used in chemistry for separating compounds and is unrelated to the concept of chromosomes.

3. **Identifying the Correct Answer**: Based on the definitions:
- **Aneuploidy** does not refer to whole sets of chromosomes.
- **Ploidy** correctly describes the presence of whole sets of chromosomes.
- The other options are not relevant.

Thus, the correct answer is **Option B: Ploidy**.

### Final Answer:
The presence of whole sets of chromosomes is called **Ploidy**.