Plant A has 2n =12 chromosomes while plant B has 2n = 16 chromosomes . An allotetaploid is raised from them . What is its chromosome number

Options

A. 7
B. 14
C. 28
D. 32

Answer

To solve the problem regarding the chromosome number of the allotetraploid raised from Plant A and Plant B, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Diploid Numbers**:
- Plant A has a diploid number (2n) of 12 chromosomes.
- Plant B has a diploid number (2n) of 16 chromosomes.

2. **Calculate the Haploid Numbers**:
- The haploid number (n) for Plant A can be calculated as:
\[ n_A = \frac{2n_A}{2} = \frac{12}{2} = 6 \]
- The haploid number (n) for Plant B can be calculated as:
\[ n_B = \frac{2n_B}{2} = \frac{16}{2} = 8 \]

3. **Determine the Chromosome Contribution to the Allotetraploid**:
- An allotetraploid organism contains the chromosome sets from both parent plants. Therefore, it will have:
\[ \text{Total chromosomes} = 2n_A + 2n_B = 12 + 16 = 28 \]

4. **Conclusion**:
- The chromosome number of the allotetraploid raised from Plant A and Plant B is 28.

### Final Answer:
The chromosome number of the allotetraploid is **28**.

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