A dihybrid condition is

Options

A. tt Rr
B. Tt rr
C. tt rr
D. Tt Rr

Explanation

### Step-by-Step Solution:

1. **Understanding Dihybrid Condition**: A dihybrid condition refers to the genetic makeup where two different traits are being studied simultaneously. Each trait is controlled by a pair of alleles.

2. **Identifying Traits and Alleles**: In this case, we have two traits:
- **Tallness**: Represented by alleles D (tall) and d (dwarf).
- **Seed Color**: Represented by alleles R (red) and r (green).

3. **Heterozygous Condition**: For a dihybrid condition, both traits must be in a heterozygous state. This means that for each trait, the organism has one dominant and one recessive allele. Thus, the genotype for a dihybrid organism would be DdRr.

4. **Dihybrid Cross**: When two dihybrid organisms (DdRr) are crossed, they produce offspring that can exhibit various combinations of traits. The typical phenotypic ratio observed in the F2 generation from such a cross is 9:3:3:1.

5. **Identifying the Correct Option**: In the context of the question, the correct option would be the one that shows both traits (tallness and seed color) in a heterozygous condition (DdRr). The other options would either show only one trait in a heterozygous condition or both traits in a homozygous condition.

### Conclusion:
The dihybrid condition is characterized by the presence of both traits in a heterozygous state, which allows for the observation of independent assortment during the formation of gametes.

---