Two statements are given - one labelled Assertion (A) and the other labelled Reason (R). Read the statements carefully and choose the option that correctly describes statements A and R.
Assertion (A): All genetic disorders, Mendelian or chromosomal, are transmitted from one generation to the other.
Reason (R): Genes are located on chromosomes.

Options

A. Both A and R are true and R is the correct explanation for A.
B. Both A and R are true but R is not the correct explanation for A.
C. A is true but R is false.
D. A is false but R is true.

Answer

To analyze the given statements, we will break down the Assertion (A) and Reason (R) step by step.

### Step 1: Understanding the Assertion (A)
Assertion (A) states that "All genetic disorders, Mendelian or chromosomal, are transmitted from one generation to the other."

- **Explanation**: Genetic disorders can be classified into two main categories: Mendelian disorders, which are caused by mutations in a single gene, and chromosomal disorders, which are caused by abnormalities in chromosome number or structure. Both types of disorders can be inherited from parents to offspring, meaning they can be passed down through generations.

### Step 2: Understanding the Reason (R)
Reason (R) states that "Genes are located on chromosomes."

- **Explanation**: This statement is a fundamental concept in genetics. Genes, which are the units of heredity, are indeed located on chromosomes. Chromosomes are structures within cells that contain DNA, and they carry the genetic information necessary for the development and functioning of organisms.

### Step 3: Evaluating the Relationship between A and R
Now we need to determine if both statements are true and if R provides a valid reason for A.

- **Truth of A**: True. All genetic disorders can be hereditary.
- **Truth of R**: True. Genes are located on chromosomes.
- **Connection**: The fact that genes are located on chromosomes (R) supports the assertion that genetic disorders are transmitted from one generation to another (A) because it explains the mechanism of inheritance.

### Conclusion
Both the Assertion (A) and Reason (R) are true, and R provides a valid reason for A. Therefore, the correct option would be that both A and R are true, and R is the correct explanation for A.

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