Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of Wheat?

Options

A. 42
B. 21
C. 7
D. 14

Answer

To find the basic chromosome number of wheat, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the given information**: The root cells of wheat have a diploid chromosome number of 2n = 42.

2. **Understand the meaning of diploid (2n)**: In this context, "2n" represents the total number of chromosomes in a diploid organism. For wheat, this means there are 42 chromosomes in total.

3. **Determine the ploidy level of wheat**: Wheat is known to be a hexaploid organism, which means it has six sets of chromosomes. This can be represented as 2n = 6x, where "x" is the basic chromosome number.

4. **Set up the equation**: Since we know that 2n = 42 and that wheat is hexaploid (2n = 6x), we can set up the equation:
\[ 6x = 42 \]

5. **Solve for x**: To find the basic chromosome number (x), we divide both sides of the equation by 6:
\[ x = \frac{42}{6} \]
\[ x = 7 \]

6. **Conclusion**: The basic chromosome number of wheat is 7.

### Final Answer:
The basic chromosome number of wheat is **7**.

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