Hybrid of pure red flowered and white flowered Pea is crossed to pure red flowered plant. The progeny shall be

Options

A. All red flowered plants
B. White flowered plants
C. `50%` red and `50%` white flowered plants
D. 3 Red : 1 white flowered plants

Answer

To solve the problem of determining the progeny from the cross of a hybrid of pure red-flowered and white-flowered pea plants with a pure red-flowered plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- Let’s denote the allele for red flowers as "R" (dominant) and the allele for white flowers as "r" (recessive).
- The pure red-flowered plant will have the genotype "RR".
- The hybrid plant (which is a cross between a pure red flower and a pure white flower) will have the genotype "Rr".

2. **Set Up the Cross**:
- We are crossing the hybrid plant (Rr) with a pure red-flowered plant (RR).
- The cross can be represented as:
- Rr (hybrid) × RR (pure red)

3. **Determine the Gametes**:
- The gametes produced by the hybrid plant (Rr) will be "R" and "r".
- The gametes produced by the pure red plant (RR) will only be "R".

4. **Perform the Punnett Square**:
- We can set up a Punnett square to visualize the possible combinations of the alleles:

| | R | R |
|-----|-----|-----|
| R | RR | RR |
| r | Rr | Rr |

5. **Analyze the Progeny**:
- The resulting genotypes from the cross are:
- 2 RR (homozygous red)
- 2 Rr (heterozygous red)
- All progeny will exhibit the red flower phenotype since both RR and Rr genotypes express the dominant red flower trait.

6. **Conclusion**:
- Therefore, the progeny from this cross will all have red flowers.

### Final Answer:
The progeny shall be all red flowered plants.

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