Cleavage differs from mitosis in lacking

Options

A. synthetic phase
B. growth phase
C. both (A) and (B)
D. none of these.

Explanation

### Step-by-Step Solution:

1. **Understanding Cleavage**: Cleavage is the series of rapid cell divisions that occur immediately after fertilization. It begins once the male and female gametes unite to form a zygote.

2. **Location of Cleavage**: Cleavage typically occurs in the fallopian tube of females, where the fertilized egg travels before implanting in the uterus.

3. **Characteristics of Cleavage**: Cleavage is characterized by a process known as holoblastic cleavage, where the entire zygote divides into smaller cells called blastomeres.

4. **Comparison with Mitosis**: Mitosis is a type of cell division that includes several phases: prophase, metaphase, anaphase, and telophase, and it is generally accompanied by a growth phase (the synthesis phase) where the cell grows and duplicates its DNA before division.

5. **Key Difference**: The main difference between cleavage and mitosis is that cleavage lacks a growth phase. In mitosis, cells undergo growth and DNA synthesis before division, while in cleavage, the cells divide without this growth phase.

6. **Conclusion**: Therefore, the correct answer to the question "Cleavage differs from mitosis in lacking" is the growth phase.

### Final Answer:
The correct answer is **B. growth phase**.

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