Mendel crossed a pure white -flowered recessive pea plant with a dominant pure red-flowered plant .the first generation og hybrid from the cross should show

Options

A. 50% white -flowered and 50% red -flowered plants
B. All red - flowered palnts
C. 75% red-flowered and 25% white -flowered plants
D. All white -flowered plants

Explanation

To solve the problem of Mendel's cross between a pure white-flowered recessive pea plant and a dominant pure red-flowered plant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Genotypes**:
- The pure white-flowered plant is recessive and can be represented as 'rr'.
- The pure red-flowered plant is dominant and can be represented as 'RR'.

2. **Set Up the Cross**:
- We are crossing the two plants:
- Parent 1 (white-flowered): rr
- Parent 2 (red-flowered): RR

3. **Perform the Cross**:
- When we cross these two plants, we can use a Punnett square to visualize the potential offspring.
- The gametes from the white-flowered plant (rr) can only contribute 'r'.
- The gametes from the red-flowered plant (RR) can contribute either 'R' (since both alleles are the same).

4. **Determine the Offspring Genotype**:
- The possible combinations from the cross will be:
- R from the red-flowered parent and r from the white-flowered parent.
- This results in all offspring being Rr (heterozygous).

5. **Determine the Phenotype**:
- Since red (R) is dominant over white (r), all the F1 generation (first generation) will exhibit the dominant trait.
- Therefore, all the plants in the first generation will have red flowers.

6. **Conclusion**:
- The first generation of hybrids from the cross should show **all red-flowered plants**.

### Final Answer:
The first generation of hybrids from the cross should show **all red-flowered plants**.

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