If hybrid red flowered plants of pea are crossed back to pure red flowered parent, the progeny will show :

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 question regarding the progeny of hybrid red flowered pea plants crossed back to pure red flowered parent, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Genotypes**:
- The hybrid red flowered plant can be represented as heterozygous (Rr), where 'R' is the dominant allele for red flowers and 'r' is the recessive allele for white flowers.
- The pure red flowered parent is homozygous dominant (RR).

2. **Identify the Cross**:
- We are performing a back cross of the hybrid red flowered plant (Rr) with the pure red flowered plant (RR).

3. **Determine the Gametes**:
- The hybrid red flowered plant (Rr) can produce two types of gametes: R and r.
- The pure red flowered plant (RR) can only produce one type of gamete: R.

4. **Set Up the Punnett Square**:
- Create a Punnett square to visualize the possible combinations of gametes:
```
R R
__________
R | RR | RR |
|______|______|
r | Rr | Rr |
|______|______|
```

5. **Analyze the Progeny**:
- From the Punnett square, we can see the possible genotypes of the progeny:
- 2 RR (homozygous dominant)
- 2 Rr (heterozygous)
- All progeny will express the dominant phenotype, which is red flowers.

6. **Conclusion**:
- Therefore, the progeny from this cross will show all red flowered plants.

### Final Answer:
The progeny will show **A) all red flower plants**.

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