In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are

Options

A. `n = 21` and `x = 7`
B. `n = 7` and `x = 21`
C. `n = 21` and `x = 21`
D. `n = 21` and `x = 14`

Answer

To solve the question regarding the haploid (n) and basic (x) numbers of chromosomes in hexaploid wheat, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hexaploid Wheat**:
- Hexaploid wheat is represented as 6n, meaning it has six sets of chromosomes.

2. **Total Number of Chromosomes**:
- In hexaploid wheat, the total number of chromosomes is 42.

3. **Calculating the Haploid Number (n)**:
- The haploid number (n) is half of the total number of chromosomes.
- Therefore, n = Total Chromosomes / 2 = 42 / 2 = 21.

4. **Understanding the Basic Number of Chromosomes (x)**:
- The basic number of chromosomes (x) refers to the number of chromosomes in one set.
- In hexaploid wheat, since it has 6 sets, we can find the basic number by dividing the haploid number by the number of sets (6).
- Thus, x = n / 6 = 21 / 3 = 7.

5. **Final Values**:
- Therefore, we conclude that the haploid number (n) is 21 and the basic number (x) is 7.

### Answer:
- Haploid number (n) = 21
- Basic number (x) = 7