Wheat plants is 6n=42 ,what will be the number of chromosomes in its monosomic ,haploid and monoploid?

Options

A. 43,21 and 7
B. 41,21 and 7
C. 15,7 and 7
D. 13,7 and 7

Answer

To solve the problem regarding the chromosome numbers in wheat plants, we start with the information given: wheat plants have a chromosome number of 6n = 42. Here’s the step-by-step solution:

### Step 1: Determine the diploid number (2n)
The notation 6n = 42 indicates that the wheat plant is hexaploid, meaning it has six sets of chromosomes. To find the diploid number (2n), we can divide the total number of chromosomes by 3 (since 6n means 6 sets):
\[ 2n = \frac{42}{3} = 14 \]
However, since we are interested in the total number of chromosomes, we can also directly state that the total number of chromosomes (2n) is 42.

### Step 2: Calculate the monosomic number
Monosomic refers to the condition where one chromosome is missing from the diploid set. Therefore, to find the number of chromosomes in a monosomic condition, we subtract one from the total diploid number:
\[ \text{Monosomic} = 42 - 1 = 41 \]

### Step 3: Calculate the haploid number
Haploid refers to half the total number of chromosomes. Since the total number of chromosomes is 42, we divide by 2 to find the haploid number:
\[ \text{Haploid} = \frac{42}{2} = 21 \]

### Step 4: Calculate the monoploid number
Monoploid refers to the basic set of chromosomes. In this case, since we know that the wheat plant is hexaploid (6n = 42), we can find the monoploid number (n) by dividing the total number of chromosomes by 6:
\[ \text{Monoploid} = \frac{42}{6} = 7 \]

### Final Summary of Chromosome Numbers
- Monosomic: 41
- Haploid: 21
- Monoploid: 7

### Conclusion
The correct answer for the number of chromosomes in its monosomic, haploid, and monoploid states is 41, 21, and 7, respectively.