A condition of not having exact multiple of haploid set is

Options

A. Aneuploidy
B. Synploidy
C. Polyploidy
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- First, let's define what a haploid set of chromosomes is. In humans, for example, a haploid set consists of 23 chromosomes (n = 23). Diploid organisms, like humans, have two sets of chromosomes (2n = 46).

2. **Identifying the Condition**:
- The question asks for a condition where the chromosome number is not an exact multiple of the haploid set. This means that if the haploid number is 'n', then the total number of chromosomes in the organism should not be a whole number multiple of 'n'.

3. **Analyzing the Options**:
- **Aneuploidy**: This condition occurs when there is a gain or loss of one or more chromosomes, resulting in a total that is not an exact multiple of the haploid set. For example, if a diploid organism has 45 chromosomes (which is not a multiple of 23), it is an aneuploid.
- **Symploidy**: This term is not commonly used in genetics and does not refer to a specific chromosomal condition.
- **Polyploidy**: This condition occurs when an organism has more than two complete sets of chromosomes (e.g., triploid, tetraploid). In polyploidy, the chromosome number is an exact multiple of the haploid set.

4. **Conclusion**:
- Based on the definitions and analysis, the correct answer to the question is **Aneuploidy**, as it is the only condition listed that describes a chromosome number that is not an exact multiple of the haploid set.

### Final Answer:
The condition of not having an exact multiple of the haploid set is **Aneuploidy**.

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