The correct statement of cleavage in humans is

Options

A. It is a process to convert zygote to gastrula.
B. It starts while the fertilized egg is in fallopian tube.
C. It is identical to normal mitosis .
D. It is starts when the egg reaches the uterus.

Answer

**Step-by-Step Solution:**

1. **Understanding Cleavage**: Cleavage is the series of rapid mitotic divisions that occur after fertilization, resulting in the formation of a multicellular structure from the zygote.

2. **Identifying the Stages**: The cleavage process does not convert the zygote directly into the gastrula. Instead, it leads to the formation of a blastula, which then undergoes further development to form the gastrula.

3. **Location of Cleavage**: Cleavage begins while the fertilized egg (zygote) is still in the fallopian tube. This is a crucial point, as it indicates where the initial divisions occur.

4. **Nature of Mitosis in Cleavage**: The mitotic divisions during cleavage are not identical to normal mitosis because they do not result in significant growth. Instead, the cells divide without increasing in size, maintaining the overall size of the zygote while forming a multicellular cluster.

5. **Timing of Cleavage**: Cleavage does not start when the aggregate reaches the uterus; it begins in the fallopian tube, and only after several divisions does the developing embryo move to the uterus for implantation.

6. **Conclusion**: Based on the analysis of the options provided, the correct statement regarding cleavage in humans is that it starts while the fertilized egg is in the fallopian tube.

**Final Answer**: The correct statement of cleavage in humans is that it starts while the fertilized egg is in the fallopian tube.

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