The trait that is expressed in homozygous and heterozygous conditions

Options

A. Codominant trait
B. Dominant trait
C. Recessive trait
D. Incomplete dominant trait

Answer

To solve the question "The trait that is expressed in homozygous and heterozygous conditions," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Homozygous**: An organism is homozygous for a trait when it has two identical alleles (e.g., TT or tt).
- **Heterozygous**: An organism is heterozygous for a trait when it has two different alleles (e.g., Tt).

2. **Identify the Types of Traits**:
- **Dominant Trait**: This trait is expressed in both homozygous (TT) and heterozygous (Tt) conditions. It masks the effect of the recessive allele.
- **Recessive Trait**: This trait is expressed only in the homozygous condition (tt) and not in the heterozygous condition (Tt).
- **Co-dominant Trait**: In this case, both alleles are fully expressed in the heterozygous condition (e.g., AB blood type).
- **Incomplete Dominance**: Here, the phenotype is a blend of the two alleles (e.g., red and white flowers producing pink flowers).

3. **Analyze the Options**:
- **Co-dominant Trait**: Both alleles are expressed equally (e.g., AB blood group).
- **Dominant Trait**: Expressed in both homozygous and heterozygous conditions.
- **Recessive Trait**: Expressed only in homozygous condition.
- **Incomplete Dominance**: Neither allele is completely dominant, resulting in a blend.

4. **Conclusion**:
- The trait that is expressed in both homozygous and heterozygous conditions is the **Dominant Trait**.

### Final Answer:
The correct answer is **Dominant Trait**.

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