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

Options

A. n=21 & X=14
B. n=21 & X=7
C. n=7 & X=21
D. n=21 & X=21

Explanation

To solve the question regarding the haploid (n) and basic (x) numbers of chromosomes in hexaploid wheat, we can break it down into clear steps:

### Step-by-Step Solution:

1. **Understand Hexaploid Wheat**:
- Hexaploid means that the organism has six sets of chromosomes. The prefix "hexa-" indicates the number six.

2. **Identify the Total Chromosome Count**:
- In hexaploid wheat (scientific name: Triticum aestivum), the total number of chromosomes is 42. This is the diploid number (2n), meaning there are 21 pairs of chromosomes.

3. **Calculate the Basic Number (x)**:
- The basic number of chromosomes (x) is defined as the number of chromosomes in a single set. Since hexaploid wheat has six sets of chromosomes, we can find x by dividing the total number of chromosomes by the number of sets:
\[ x = \frac{Total \, Chromosomes}{Number \, of \, Sets} = \frac{42}{6} = 7 \]

4. **Calculate the Haploid Number (n)**:
- The haploid number (n) represents the number of chromosomes in one complete set. In hexaploid wheat, since it has three sets of the basic number (x), we can find n by multiplying the basic number by 3:
\[ n = x \times 3 = 7 \times 3 = 21 \]

5. **Conclusion**:
- Therefore, the haploid number (n) is 21 and the basic number (x) is 7.

### Final Answer:
- The haploid (n) number of chromosomes in hexaploid wheat is **21**.
- The basic (x) number of chromosomes in hexaploid wheat is **7**.