Which of the following genotype represents heterozygous condition ?

Options

A. `"TT"`
B. `"tt"`
C. `Tt`
D. `"RR"`

Answer

To determine which genotype represents a heterozygous condition, we need to understand the definitions of homozygous and heterozygous genotypes.

### Step-by-Step Solution:

1. **Understand Genotypes**: A genotype consists of two alleles for a particular gene. These alleles can be either the same (homozygous) or different (heterozygous).

2. **Identify Homozygous Condition**:
- Homozygous dominant: Both alleles are dominant (e.g., TT).
- Homozygous recessive: Both alleles are recessive (e.g., tt).

3. **Identify Heterozygous Condition**:
- Heterozygous: One allele is dominant and the other is recessive (e.g., Tt).

4. **Analyze the Given Options**:
- **Option A: TT** - Both alleles are dominant (homozygous dominant).
- **Option B: tt** - Both alleles are recessive (homozygous recessive).
- **Option C: Tt** - One allele is dominant and the other is recessive (heterozygous).
- **Option D: RR** - Both alleles are dominant (homozygous dominant).

5. **Conclusion**: The only genotype that represents a heterozygous condition is **Option C: Tt**.

### Final Answer:
The genotype that represents a heterozygous condition is **Tt**.

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