Tay sach's disease is

Options

A. Recessive and autosomal
B. Dominant and autosomal
C. Sex-linked
D. Not a herediatry disease

Answer

**Step-by-Step Solution:**

1. **Understanding Tay-Sachs Disease**: Tay-Sachs disease is a genetic disorder that affects the nervous system. It is important to recognize that it is inherited and not acquired.

2. **Identifying the Type of Inheritance**: The question asks about the nature of Tay-Sachs disease. It is crucial to determine whether it is autosomal or sex-linked and whether it is dominant or recessive.

3. **Chromosomal Location**: Tay-Sachs disease is caused by a mutation in a gene located on chromosome 15, which is one of the autosomes. This indicates that Tay-Sachs is an autosomal disorder.

4. **Recessive Nature**: Tay-Sachs disease is classified as an autosomal recessive disorder. This means that an individual must inherit two copies of the mutated gene (one from each parent) to express the disease.

5. **Eliminating Incorrect Options**:
- The option "dominant and autosomal" is incorrect because Tay-Sachs is not dominant.
- The option "sex-linked" is incorrect because it is not linked to the sex chromosomes.
- The option "not a hereditary disease" is also incorrect as it is indeed hereditary.

6. **Conclusion**: Based on the analysis, the correct answer is that Tay-Sachs disease is an autosomal recessive disorder.

**Final Answer**: Tay-Sachs disease is an autosomal recessive disorder (Option A).

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