Find odd one (w.r.t dominant traits in humans)

Options

A. Blue eyes
B. Brown eyes
C. Free ear lobes
D. Myotonic dystrophy

Answer

To determine the odd one out with respect to dominant traits in humans, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Traits**: The options given are:
- Blue eyes
- Brown eyes
- Free earlobes
- Myotonic dystrophy

2. **Determine Dominance**:
- **Blue Eyes**: This trait is considered recessive in humans. Individuals with blue eyes must inherit two copies of the blue eye allele (one from each parent).
- **Brown Eyes**: This trait is dominant. The brown eye allele can mask the presence of the blue eye allele, meaning that a person only needs one copy of the brown eye allele to have brown eyes.
- **Free Earlobes**: This trait is also dominant. Individuals with at least one copy of the free earlobe allele will exhibit free earlobes.
- **Myotonic Dystrophy**: This is a genetic disorder that is also inherited in an autosomal dominant manner. Therefore, having one copy of the myotonic dystrophy allele can result in the disease.

3. **Identify the Odd One Out**:
- From the analysis, blue eyes are the only trait that is recessive. All the other traits (brown eyes, free earlobes, and myotonic dystrophy) are dominant traits.

4. **Conclusion**: The odd one out with respect to dominant traits in humans is **blue eyes**.

### Final Answer: Blue eyes

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