Which of the following is called heterotypic division :-

Options

A. Meiosis-I
B. Meiosis-II
C. Mitosis
D. Amitosis

Answer

To determine which of the following is called heterotypic division, we need to understand the definitions and characteristics of the options provided.

### Step-by-Step Solution:

1. **Understand the term "heterotypic division":**
- Heterotypic division is also known as reductional division. This type of division reduces the chromosome number by half, transitioning from a diploid (2n) state to a haploid (n) state.

2. **Analyze the options:**
- **Option 1: Meiosis 1**
- Meiosis 1 is indeed a reductional division where homologous chromosomes are separated, resulting in two cells that each have half the number of chromosomes (haploid).
- **Option 2: Meiosis 2**
- Meiosis 2 is similar to mitosis and does not reduce the chromosome number; it separates sister chromatids without reducing the total chromosome count.
- **Option 3: Mitosis**
- Mitosis is an equational division where the chromosome number remains the same in the daughter cells as in the parent cell.
- **Option 4: Amitosis**
- Amitosis is a direct division of the nucleus and does not involve the typical stages of mitosis or meiosis; it also does not reduce the chromosome number.

3. **Identify the correct answer:**
- Since heterotypic division refers specifically to the reduction of chromosome number, the correct answer is **Option 1: Meiosis 1**.

### Final Answer:
The correct answer is **Meiosis 1**.

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