Slight difference in identical twins support the hypothesis that

Options

A. dominance may be incomplete
B. single gene may produce multiple effect
C. the expression of genetic character is affected by environment
D. they developed from separate fertilized eggs

Answer

To solve the question regarding the slight differences in identical twins and what hypothesis it supports, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Identical Twins**:
- Identical twins, also known as monozygotic twins, originate from a single fertilized egg that splits into two embryos. This means they share the same genetic material.

2. **Identifying the Differences**:
- Despite having identical genetic makeup, identical twins can exhibit slight differences in traits such as personality, intelligence (IQ), and preferences. These differences can be subtle but significant.

3. **Evaluating the Options**:
- **Option 1**: Dominance may be incomplete - This does not explain the differences observed in identical twins as they share the same genes.
- **Option 2**: A single gene may produce multiple effects - While this is true in some cases, it does not specifically account for the differences seen in identical twins.
- **Option 3**: The expression of genetic character is affected by the environment - This option suggests that environmental factors can influence how genes are expressed, leading to differences in traits among identical twins.
- **Option 4**: They develop from separate fertilized eggs - This is incorrect as identical twins come from the same fertilized egg.

4. **Conclusion**:
- The most appropriate hypothesis that explains the slight differences in identical twins is **Option 3**: The expression of genetic character is affected by the environment. This indicates that while twins share the same genetic information, external factors can lead to variations in their traits.

### Final Answer:
The slight differences in identical twins support the hypothesis that the expression of genetic character is affected by the environment.

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