Theoretically, the modified allele could be responsible for the production of A. a non functional enzyme B. normal or less effecient enzyme C. No enzyme at all

Options

A. A only
B. A & B only
C. B only
D. A,B and C

Answer

To solve the question regarding the effects of a modified allele on enzyme production, we can analyze the options provided:

### Step-by-Step Solution:

1. **Understanding Modified Alleles**:
- Modified alleles are those that have undergone mutations, which can lead to changes in their function. This can affect the proteins they encode, such as enzymes.

2. **Analyzing Option A - Non-functional enzyme**:
- A modified allele could produce a non-functional enzyme if the mutation significantly alters the enzyme's active site or overall structure, preventing it from catalyzing reactions effectively. This is a possible outcome.

3. **Analyzing Option B - Normal or less efficient enzyme**:
- A modified allele might also lead to the production of an enzyme that is either normal or less efficient. If the mutation only slightly affects the enzyme's structure, it may still function but not as effectively as the normal enzyme. This is another possible outcome.

4. **Analyzing Option C - No enzyme at all**:
- In some cases, a modified allele could result in no enzyme being produced at all. This could happen if the mutation causes a premature stop codon in the mRNA, preventing the enzyme from being synthesized. This is also a possible outcome.

5. **Conclusion**:
- Since all three options (A, B, and C) describe potential outcomes of a modified allele, the correct answer is that the modified allele could be responsible for the production of a non-functional enzyme, a normal or less efficient enzyme, or no enzyme at all.

### Final Answer:
Theoretically, the modified allele could be responsible for:
- A. a non-functional enzyme
- B. normal or less efficient enzyme
- C. no enzyme at all

Thus, the correct answer is **A, B, and C**.