Haemophilic gene does not transfer from :-

Options

A. Haemophilic father to son
B. Haemophilic mother to son
C. Haemophilic father to daughter
D. Haemphilic mother to son & daughter

Answer

**Step-by-Step Solution:**

1. **Understanding Hemophilia**: Hemophilia is a genetic disorder that affects the blood's ability to clot properly. It is classified as a sex-linked recessive disorder, meaning the gene responsible for hemophilia is located on the X chromosome.

2. **Identifying the Chromosomal Basis**: Since hemophilia is linked to the X chromosome, it is important to understand how the X and Y chromosomes are inherited. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

3. **Inheritance from Father to Son**: A father contributes either an X or a Y chromosome to his offspring. Sons receive a Y chromosome from their father and an X chromosome from their mother. Therefore, a father cannot pass on his X chromosome (which carries the hemophilic gene) to his son.

4. **Inheritance from Mother to Son**: A mother can pass on one of her two X chromosomes to her son. If she carries the hemophilic gene on one of her X chromosomes, she can pass that gene to her son, making it possible for a hemophilic mother to have a hemophilic son.

5. **Inheritance from Father to Daughter**: A father passes his X chromosome to his daughter. If the father has the hemophilic gene on his X chromosome, he can pass it to his daughter, which means a hemophilic father can have a hemophilic daughter.

6. **Inheritance from Mother to Daughter**: Similarly, a mother can also pass one of her X chromosomes to her daughter. If she carries the hemophilic gene, she can pass it on to her daughter as well.

7. **Conclusion**: Based on the above analysis, the hemophilic gene does not transfer from a hemophilic father to his son. Therefore, the correct answer is that the hemophilic gene does not transfer from a hemophilic father to son.

**Final Answer**: The hemophilic gene does not transfer from a hemophilic father to son.

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