What will be the percentage inheritance of a disorder from an X - linked diseases father to his son ?

Options

A. `0%`
B. `25%`
C. `50%`
D. `100%`

Answer

To solve the question of the percentage inheritance of an X-linked disorder from a father to his son, we can follow these steps:

### Step-by-Step Solution:

1. **Understand X-linked Inheritance**:
- X-linked disorders are caused by mutations in genes located on the X chromosome. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

2. **Identify the Parent's Chromosomes**:
- The father has an X-linked disorder, which means he has one affected X chromosome (let's denote it as X^d for the affected allele) and one Y chromosome (Y).
- The mother has two X chromosomes, but we don't know if she is affected or not. However, for this question, we focus on the father's contribution.

3. **Determine the Inheritance to the Son**:
- Sons inherit their X chromosome from their mother and their Y chromosome from their father. Therefore, the son will receive the Y chromosome from the father and one of the X chromosomes from the mother.

4. **Conclusion on Inheritance**:
- Since the father contributes the Y chromosome to his son, he does not pass on his affected X chromosome. Thus, the son cannot inherit the X-linked disorder from his father.

5. **Final Answer**:
- The percentage inheritance of the disorder from an X-linked disease father to his son is **0%**.

### Summary of the Answer:
The correct answer is **A) 0%**.