When F_1 program shown intermediate phenotype between dominant and recessive phenotypes such as gene interaction is called

Options

A. Complete dominance
B. Over dominance
C. pseudodominance
D. Incomplete dominance

Answer

To solve the question regarding the type of gene interaction that results in an intermediate phenotype between dominant and recessive traits, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Phenotypes**:
- Begin by identifying the dominant and recessive traits. In the example given, red flower color is dominant (represented as "R") and white flower color is recessive (represented as "r").

2. **Crossing the Traits**:
- When a red flower (RR) is crossed with a white flower (rr), the offspring (F1 generation) display an intermediate phenotype. In this case, the resulting flower color is pink, which is neither fully red nor fully white.

3. **Defining Incomplete Dominance**:
- The phenomenon where the F1 generation exhibits a phenotype that is a blend of the two parental traits is known as incomplete dominance. This means that neither allele is completely dominant over the other, resulting in a third phenotype.

4. **Evaluating Other Options**:
- **Complete Dominance**: In this case, the dominant trait completely masks the recessive trait, which is not what we observe here.
- **Over Dominance**: This refers to a situation where the heterozygote is more vigorous than either homozygote, which does not apply to the intermediate phenotype.
- **Pseudo Dominance**: This is a false dominance situation where the recessive allele is expressed due to the absence of a dominant allele, which is also not applicable in this case.

5. **Conclusion**:
- Based on the definitions and examples, the correct answer to the question is "incomplete dominance," as it accurately describes the situation where the F1 generation shows an intermediate phenotype between the dominant and recessive traits.

### Final Answer:
The type of gene interaction where the F1 generation shows an intermediate phenotype between dominant and recessive phenotypes is called **incomplete dominance**.

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