Cri-du chat is

Options

A. Gene disorder
B. Allosomal disorder
C. X-chromosomal disorder
D. Autosomal disorder

Answer

**Step-by-Step Solution:**

1. **Understanding Cri-du-chat Syndrome**:
- Cri-du-chat is a genetic condition caused by a deletion of a portion of chromosome 5. This deletion typically affects the short arm (p arm) of the chromosome.

2. **Identifying the Nature of the Disorder**:
- The disorder is classified based on the type of chromosome affected. Since Cri-du-chat involves a deletion on an autosome (chromosome 5), it is categorized as an autosomal disorder.

3. **Reviewing the Options**:
- Option A: Gene disorder - Incorrect, as Cri-du-chat is not solely caused by a single gene mutation.
- Option B: Allosomal disorder - Incorrect, as this term refers to disorders related to sex chromosomes, which does not apply here.
- Option C: X-chromosomal disorder - Incorrect, as Cri-du-chat is not linked to the X chromosome.
- Option D: Autosomal disorder - Correct, as Cri-du-chat syndrome is indeed an autosomal deletion syndrome.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is Option D: Autosomal disorder.