Certain genetic disorders show a higher proportion of males to be affected as compared to females that are affected . Such genetic disorders can arise due to

Options

A. Recessive character carried by Y chromosomes
B. Dominant character carried by Y chromosome
C. Dominant trait carried by X chromosome
D. Recessive trait carried by X chromosome

Answer

To solve the question regarding genetic disorders that show a higher proportion of males affected compared to females, we need to analyze the options provided and understand the underlying principles of sex-linked inheritance.

### Step-by-Step Solution:

1. **Understand Sex-Linked Inheritance**:
- Genetic disorders can be linked to sex chromosomes (X or Y). In humans, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

2. **Analyze the Options**:
- **Option A**: Recessive character carried by Y chromosome.
- This is unlikely because Y-linked traits affect only males and do not explain the higher proportion of affected males compared to females.
- **Option B**: Dominant character carried by X chromosome.
- If this were true, both males and females would be equally affected since a dominant trait would express in both sexes.
- **Option C**: Dominant trait carried by X chromosome.
- Similar to option B, this would lead to both males and females being affected equally, which contradicts the question.
- **Option D**: Recessive trait carried by X chromosome.
- This is the most plausible option. Males (XY) will express the trait if they inherit the recessive allele on their single X chromosome, while females (XX) can be carriers if they have one recessive allele and one normal allele.

3. **Conclusion**:
- Since males are more frequently affected than females, the genetic disorder is likely due to a recessive trait carried on the X chromosome. Females can be carriers without showing symptoms, while males will express the disorder.

### Final Answer:
- The correct answer is **D. Recessive trait carried by X chromosome**.