Select the correct match (w.r.t dihybrid phenotypic ratio in `F_(2)` generation)

Options

A. Recessive epistasis : `12 : 3 : 1`
B. Dominant epistasis : `9 : 3 : 4`
C. Collaborative gene : `9 : 3 : 3 : 1`
D. Duplicate genes : `9 : 7`

Answer

To solve the question regarding the correct match of dihybrid phenotypic ratios in the F2 generation, we will analyze the different types of epistasis and gene interactions mentioned in the question.

### Step-by-Step Solution:

1. **Understand Dihybrid Cross**:
A dihybrid cross involves two traits, each controlled by different genes. In a typical Mendelian dihybrid cross, the F2 generation exhibits a phenotypic ratio of 9:3:3:1.

**Hint**: Recall the basic Mendelian ratios for dihybrid crosses.

2. **Recessive Epistasis**:
In recessive epistasis, one gene can mask the expression of another gene when in a homozygous recessive state. The phenotypic ratio for recessive epistasis is 9:3:4.

**Hint**: Remember that recessive epistasis occurs when one gene's recessive allele masks another gene's effects.

3. **Dominant Epistasis**:
In dominant epistasis, a dominant allele at one locus can mask the expression of alleles at another locus. The phenotypic ratio for dominant epistasis is 12:3:1.

**Hint**: Think about how a dominant allele can overshadow the effects of other alleles.

4. **Collaborative Genes**:
Collaborative genes work together to produce a single trait. The phenotypic ratio for this interaction is the same as the standard dihybrid ratio, which is 9:3:3:1.

**Hint**: Collaborative genes enhance or combine effects to produce a specific phenotype.

5. **Duplicate Genes**:
Duplicate genes can produce the same phenotype when either gene is present. The phenotypic ratio for duplicate genes is 15:1.

**Hint**: Consider how duplicate genes can lead to redundancy in phenotypic expression.

6. **Identify the Correct Match**:
Based on the above analysis:
- Recessive Epistasis: 9:3:4 (Incorrect match given)
- Dominant Epistasis: 12:3:1 (Correct match given)
- Collaborative Genes: 9:3:3:1 (Correct match)
- Duplicate Genes: 15:1 (Incorrect match given)

The correct match for dihybrid phenotypic ratio in F2 generation is **Collaborative Genes: 9:3:3:1**.

### Final Answer:
The correct match regarding dihybrid phenotypic ratio in F2 generation is **Collaborative Genes: 9:3:3:1**.