Basic set of chromosome number is called

Options

A. Eupolid
B. Polyploid
C. Aneuploid
D. Monoploid

Answer

**Step-by-Step Solution:**

1. **Understanding Chromosome Numbers:**
- Chromosomes are structures within cells that contain DNA. They come in pairs, and the total number of chromosomes in a cell is referred to as the chromosome number.

2. **Defining Key Terms:**
- The basic set of chromosomes in an organism is referred to by the symbol 'n'. This represents the haploid number, which is the number of chromosomes in a gamete (sperm or egg).
- The diploid number, represented as '2n', is the total number of chromosomes in a somatic (body) cell, which includes pairs of chromosomes.

3. **Analyzing the Options:**
- **Euploid:** This term refers to a cell or organism that has a complete set of chromosomes. It can refer to normal diploid or haploid cells but does not specifically denote the basic set.
- **Polyploid:** This term indicates an organism or cell that has more than two complete sets of chromosomes (e.g., triploid, tetraploid). It is not the basic set.
- **Aneuploid:** This term refers to a condition where there is an abnormal number of chromosomes, either more or less than the normal set. It does not refer to the basic set.
- **Monoploid:** This term specifically refers to the basic set of chromosomes, which is represented as 'n'.

4. **Conclusion:**
- The basic set of chromosome number is called **monoploid**. Therefore, the correct answer to the question is **monoploid**.