The shape and stanch synthesis in pea seeds is controlled by one gene. Which among the following statements is/ are correct for heterozygotes ?
(i) Round seeds are due to the law of dominance while the size of the starch grain is due to the law of incomplete dominance .
(ii)Round seeds are due to law of incomplete dominance while the size of the starch grain is due to the law of dominance .
(iii) Dominance is not an autonomous feature of a gene or the product that it has information for.

Options

A. Both (i) and (ii) are correct but (ii) is false
B. Both (ii) and (iii) are correct but (i) is false
C. Both (i) and (iii) are correct but (ii) is false
D. Only (i) is correct and both (ii) & (iii) are false

Answer

To solve the question regarding the shape and starch synthesis in pea seeds controlled by one gene, we need to analyze the three statements provided about heterozygotes. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Genetic Background
- The shape of pea seeds (round vs. wrinkled) is controlled by one gene, with round seeds being dominant (B) and wrinkled seeds being recessive (b).
- Starch synthesis is also influenced by this gene, but the expression of starch grain size can show different patterns of inheritance.

### Step 2: Analyze the Statements
1. **Statement (i)**: "Round seeds are due to the law of dominance while the size of the starch grain is due to the law of incomplete dominance."
- In heterozygotes (Bb), the round seed shape is indeed a result of the law of dominance (B is dominant over b).
- The size of the starch grain in heterozygotes shows an intermediate phenotype, indicating incomplete dominance.
- **Conclusion**: This statement is **correct**.

2. **Statement (ii)**: "Round seeds are due to law of incomplete dominance while the size of the starch grain is due to the law of dominance."
- This is the opposite of statement (i). Round seeds are not due to incomplete dominance; they are due to dominance.
- Therefore, this statement is **incorrect**.

3. **Statement (iii)**: "Dominance is not an autonomous feature of a gene or the product that it has information for."
- This statement reflects the idea that dominance is not an inherent quality of the gene itself but rather how it interacts with other alleles.
- This is true, as dominance can vary depending on the context of the alleles involved.
- **Conclusion**: This statement is **correct**.

### Step 3: Final Evaluation
- From the analysis:
- Statement (i) is correct.
- Statement (ii) is incorrect.
- Statement (iii) is correct.

### Final Answer
The correct statements for heterozygotes are statements (i) and (iii).