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% red flowered
B. 50% pink flowered
C. All red flowered
D. All pink flowered.

Answer

To solve the problem, we need to understand the basic principles of Mendelian genetics, specifically the concepts of dominant and recessive traits. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Traits**:
- In this scenario, we have two traits:
- Red flower color (dominant trait)
- White flower color (recessive trait)

2. **Determine the Genotypes**:
- The pure red-flowered plant is homozygous dominant, which we can denote as **RR**.
- The pure white-flowered plant is homozygous recessive, denoted as **rr**.

3. **Perform the Cross**:
- When we cross the red-flowered plant (RR) with the white-flowered plant (rr), we can set up a Punnett square to visualize the offspring.
- The gametes from the red-flowered plant can only be **R** (since it is homozygous), and the gametes from the white-flowered plant can only be **r**.

4. **Fill in the Punnett Square**:
- The resulting combinations from the cross would be:
- R from RR and r from rr gives us Rr (red-flowered)
- Since both gametes from RR are R, all offspring will be Rr.

5. **Determine the Phenotype of the Offspring**:
- All offspring (Rr) will express the dominant red flower trait because the presence of at least one dominant allele (R) results in the expression of the dominant phenotype.

6. **Conclusion**:
- Therefore, the first generation of hybrids (F1 generation) from this cross will show **all red-flowered plants**.

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