A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
a) Represent this cross in the form of pedigree chart. Give the genotypes of the daughter and her husband.
b) Write the conclusion you draw of the inheritance pattern of this disease.

Explanation

### Step-by-Step Solution

**a) Represent the cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.**

1. **Identify the Family Members:**
- The normal couple (parents) who have a haemophilic son and a normal daughter.
- The daughter who marries a normal man and has a haemophilic grandson.

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