Cleavage differes from mitosis in lacking

Options

A. synthetic phse
B. growth phase
C. both a and b
D. none of these.

Explanation

### Step-by-Step Solution:

1. **Understanding Cleavage**: Cleavage refers to the series of rapid cell divisions that occur after fertilization. It is the process by which a single fertilized egg (zygote) divides to form multiple cells (blastomeres) without significant growth in size.

2. **Location of Cleavage**: Cleavage typically begins in the fallopian tube (oviduct) after fertilization of the egg.

3. **Type of Cleavage**: In the case of a fertilized egg, cleavage is often described as "holoblastic," meaning that the entire egg divides completely during the cleavage process.

4. **Comparison with Mitosis**: Mitosis is a type of cell division that includes several phases: prophase, metaphase, anaphase, and telophase, followed by cytokinesis. Importantly, mitosis includes a growth phase (interphase) where the cell grows and prepares for division.

5. **Key Difference**: The main difference between cleavage and mitosis is that cleavage lacks a growth phase. During cleavage, the cells divide rapidly without growing in size, while mitosis involves a growth phase where the cell increases in size and duplicates its organelles and DNA.

6. **Conclusion**: Based on the differences discussed, cleavage differs from mitosis in lacking the growth phase.

7. **Final Answer**: The correct answer is that cleavage differs from mitosis in lacking the growth phase.