Which is a dominant trait ?

Options

A. Colour blindness
B. Albinism
C. Haemophilia
D. `Rh^(+)` factor.

Answer

To determine which trait is dominant among the options provided, we can analyze the traits mentioned in the video transcript step by step.

### Step-by-Step Solution:

1. **Understanding Dominant vs. Recessive Traits**:
- Dominant traits are those that can express themselves even when only one copy of the allele is present. Recessive traits require two copies of the allele to be expressed.

2. **Identifying the Traits Mentioned**:
- The traits discussed in the transcript include color blindness, albinism, hemophilia, and the "arach factor."

3. **Analyzing Color Blindness**:
- Color blindness is a sex-linked recessive trait. This means it is not dominant because it requires two copies of the recessive allele (in males, one copy is enough due to the presence of only one X chromosome).

4. **Analyzing Albinism**:
- Albinism is also a recessive trait. It occurs when all alleles responsible for skin color are in recessive form. Therefore, it is not a dominant trait.

5. **Analyzing Hemophilia**:
- Hemophilia is another sex-linked recessive disorder. Like color blindness, it requires two copies of the recessive allele (or one in males) to manifest, making it not a dominant trait.

6. **Analyzing the Arach Factor**:
- The arach factor is mentioned as a dominant trait, present in nearly 80% of humans. This indicates that it can express itself even if only one copy of the allele is present.

7. **Conclusion**:
- Based on the analysis, the dominant trait among the options provided is the arach factor.

### Final Answer:
The dominant trait is the **arach factor**.

---