Satellite means
(a) Terminal part of the chromosome beyond secondary constriction
(b) Terminal part of the chromosome beyond primary constriction
(c) Terminal part of chromosome beyond tertiary constriction
(d) None of the above

Options

A. Terminal part of the chromosome beyond secondary constriction
B. Terminal part of the chromosome beyond primary constriction
C. Terminal part of chromosome beyond tertiary constriction
D. None of the above

Answer

To solve the question regarding the meaning of "satellite" in the context of chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Chromosome Structure**:
- Chromosomes have specific regions known as constrictions. The primary constriction is where the centromere is located, and it divides the chromosome into two arms.

2. **Identifying Types of Constrictions**:
- There are different types of constrictions: primary, secondary, and tertiary. The primary constriction is the centromere, while the secondary constriction is located further along the chromosome.

3. **Defining Satellite**:
- Satellites are specific structures found on certain chromosomes, commonly referred to as satellite or "sat" chromosomes. These structures are located beyond the secondary constriction.

4. **Evaluating the Options**:
- (a) Terminal part of the chromosome beyond secondary constriction - This is correct as satellites are found here.
- (b) Terminal part of the chromosome beyond primary constriction - This is incorrect since satellites are not located here.
- (c) Terminal part of the chromosome beyond tertiary constriction - This is also incorrect as it does not pertain to the definition of satellites.
- (d) None of the above - This is incorrect because option (a) is correct.

5. **Conclusion**:
- Based on the definitions and structures discussed, the correct answer is (a) Terminal part of the chromosome beyond secondary constriction.

### Final Answer:
(a) Terminal part of the chromosome beyond secondary constriction.

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