Which cross yields red, white and pink flower variety of Snapdragon flower.

Options

A. `R R xxRr`
B. `RrxxR R`
C. `RrxxRr`
D. `Rrxxrr`

Answer

To determine which cross yields red, white, and pink flower varieties of Snapdragon flowers, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- The red flower in Snapdragon is represented by the genotype **RR** (homozygous dominant).
- The white flower is represented by the genotype **rr** (homozygous recessive).

2. **Understand the F1 Generation**:
- When we cross a red flower (RR) with a white flower (rr), all offspring in the F1 generation will have the genotype **Rr**.
- The phenotype of these F1 hybrids is pink due to incomplete dominance, where neither allele is completely dominant over the other.

3. **Self-Fertilization of F1 Generation**:
- If we self-fertilize the F1 generation (Rr x Rr), we can determine the phenotypic ratios in the F2 generation.
- The possible genotypes from this cross are:
- RR (red)
- Rr (pink)
- rr (white)

4. **Punnett Square Analysis**:
- Setting up a Punnett square for the cross Rr x Rr:
```
R r
__________
R | RR | Rr |
|______|_____|
r | Rr | rr |
|______|_____|
```
- The resulting genotypes are:
- 1 RR (red)
- 2 Rr (pink)
- 1 rr (white)

5. **Phenotypic Ratio**:
- The phenotypic ratio from this cross is 1 red : 2 pink : 1 white.

6. **Conclusion**:
- Therefore, the cross that yields red, white, and pink flower varieties in Snapdragon is **Rr x Rr**.

### Final Answer:
The correct cross that yields red, white, and pink flower varieties of Snapdragon is **Rr x Rr**.

---