During incomplete dominance , `F_(2)` generation will have

Options

A. 3:1 genotypic ratio
B. 3:1 phenotypic ratio
C. 1:2:1 phenotypic ratio
D. 1:2:1 genotypic ratio.

Answer

To solve the question regarding the F2 generation during incomplete dominance, we will follow these steps:

### Step 1: Understand Incomplete Dominance
In incomplete dominance, the phenotype of the heterozygous genotype is an intermediate of the phenotypes of the two homozygous parents. For example, if we have a red flower plant (RR) and a white flower plant (rr), the F1 generation will have pink flowers (Rr).

### Step 2: Identify the Genotypes of the Parents
Let’s denote:
- Red flower genotype: RR (homozygous dominant)
- White flower genotype: rr (homozygous recessive)

### Step 3: Cross the Parents to Get F1 Generation
When we cross RR (red) with rr (white), the F1 generation will all be Rr (pink flowers).

### Step 4: Selfing the F1 Generation
Now, we self the F1 generation (Rr x Rr). This means we will cross two heterozygous individuals.

### Step 5: Determine the Gametes
From Rr, the possible gametes are R and r.

### Step 6: Create a Punnett Square
We can set up a Punnett square to find the genotypes of the F2 generation:
```
R r
------------
R | RR | Rr |
------------
r | Rr | rr |
```

### Step 7: Analyze the Results
From the Punnett square, we can see:
- 1 RR (red flowers)
- 2 Rr (pink flowers)
- 1 rr (white flowers)

### Step 8: Write the Genotype Ratio
The genotype ratio in the F2 generation is:
- 1 RR : 2 Rr : 1 rr

### Step 9: Write the Phenotype Ratio
The phenotype ratio corresponding to these genotypes is:
- 1 red (RR) : 2 pink (Rr) : 1 white (rr)

### Conclusion
Thus, the F2 generation will have:
- Genotype ratio: 1 : 2 : 1
- Phenotype ratio: 1 : 2 : 1

### Final Answer
The correct answer is that during incomplete dominance, the F2 generation will have a genotype ratio of 1:2:1 and a phenotype ratio of 1:2:1.

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