Migration of ....... towards the opposite poles is characteristic feature of anaphase during mitosis.

Options

A. Single chromatid chromosomes
B. double chromatid chromosomes
C. tetrad chromosomes
D. dyad chromosomes

Answer

To solve the question regarding the migration of a specific type of chromosome during anaphase of mitosis, we can follow these steps:

### Step 1: Understand the Process of Mitosis
- Mitosis is a process of cell division that results in two genetically identical daughter cells. It consists of several phases: prophase, metaphase, anaphase, and telophase.

### Step 2: Focus on Anaphase
- Anaphase is the stage of mitosis where the sister chromatids are separated and pulled towards opposite poles of the cell. This is a crucial step to ensure that each daughter cell receives an identical set of chromosomes.

### Step 3: Identify Chromosome Structure
- Each chromosome consists of two sister chromatids joined at a region called the centromere. During anaphase, the centromere splits, allowing the sister chromatids to move apart.

### Step 4: Analyze the Options
- **Option A: Single chromatid chromosome** - This refers to one of the sister chromatids after the centromere has split.
- **Option B: Double-stranded chromatid chromosome** - This term is somewhat misleading as it implies both chromatids are still joined.
- **Option C: Tetrad chromosome** - This term is related to meiosis, not mitosis.
- **Option D: Dyad chromosome** - This term refers to a pair of sister chromatids but does not specify their movement.

### Step 5: Conclusion
- Since during anaphase, it is the individual sister chromatids (now referred to as single chromatids) that migrate towards opposite poles, the correct answer is **Option A: Single chromatid chromosome**.

### Final Answer
The migration of **single chromatid chromosomes** towards the opposite poles is a characteristic feature of anaphase during mitosis.

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