The expression of a phenotype

Options

A. depends on the genotype but doesn't depend on the environment
B. depends on the environment but doesn't depend on the genotype
C. depends on both environment as well as on the genotype
D. doesn't depend on either the environment or the genotype

Answer

To solve the question regarding the expression of a phenotype, we need to analyze the options provided and understand the relationship between genotype, phenotype, and the environment.

### Step-by-Step Solution:

1. **Understanding Phenotype**:
- The phenotype refers to the observable characteristics or traits of an organism. This includes physical appearance, behavior, and physiological properties.

**Hint**: Remember that phenotype is what you can see or measure in an organism.

2. **Analyzing the Options**:
- **Option 1**: "Depends on the genotype but does not depend on the environment."
- This option is incorrect because while genotype plays a crucial role in determining phenotype, environmental factors also significantly influence the expression of traits.

**Hint**: Consider how environmental factors like temperature, nutrition, and light can affect traits.

- **Option 2**: "Depends on the environment but does not depend on the genotype."
- This option is also incorrect. While the environment can influence phenotype, the genotype is essential for the initial expression of traits.

**Hint**: Think about how certain traits can only be expressed if the right genes are present.

- **Option 3**: "Depends on both environment as well as genotype."
- This option is correct. The phenotype is the result of the interaction between the organism's genetic makeup (genotype) and environmental influences.

**Hint**: Recall examples where both genetics and environment play a role, such as in the case of height or skin color.

- **Option 4**: "Does not depend on either the environment or the genotype."
- This option is incorrect because it disregards the fundamental roles that both genotype and environment play in determining phenotype.

**Hint**: Consider that all traits must have some genetic basis and are often influenced by the environment.

3. **Conclusion**:
- The correct answer is **Option 3**: The expression of a phenotype depends on both the genotype and the environment.

### Final Answer:
The expression of a phenotype depends on both genotype and environment (Option 3).