Haemophilia is a

Options

A. autosomal dominant disorder
B. outosomal recessive disorder
C. X-linked recessive disorder
D. X-linked dominant disorder

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks to identify the type of disorder that hemophilia is classified as. The options provided are autosomal dominant disorder, autosomal recessive disorder, X-linked recessive disorder, and X-linked dominant disorder.

2. **Identifying the Nature of Hemophilia**: Hemophilia is known to be a genetic disorder that affects the blood's ability to clot. It is important to note that it is not an autosomal disorder, which means it is not located on the non-sex chromosomes.

3. **Eliminating Incorrect Options**: Since hemophilia is a sex-linked disorder, the options of autosomal dominant and autosomal recessive can be eliminated. This leaves us with the options of X-linked recessive and X-linked dominant.

4. **Determining the Correct Classification**: Hemophilia is specifically classified as an X-linked recessive disorder. This means that the gene responsible for hemophilia is located on the X chromosome and that the disorder is recessive, meaning that it typically manifests in males who have only one X chromosome. Females can be carriers if they have one affected X chromosome and one normal X chromosome.

5. **Understanding the Implications of Hemophilia**: In individuals with hemophilia, a deficiency in certain proteins that are essential for blood clotting leads to excessive bleeding, even from minor injuries. This is due to the inability to form blood clots effectively.

6. **Conclusion**: Based on the analysis, the correct answer is that hemophilia is an X-linked recessive disorder.

**Final Answer**: Hemophilia is an X-linked recessive disorder.

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