Which is correct about morula.

Options

A. Less cytoplasm and less DNA than zygote
B. Same amount of cytoplasm and DNA as zygote
C. More cytoplasm and more DNA than zygote
D. Same amount of cytoplasm but much more DNA than zygote.

Answer

### Step-by-Step Solution:

1. **Understanding Morula Formation**:
- The morula is an early stage in embryonic development that occurs after the zygote undergoes several rounds of mitotic divisions (cleavage).
- Initially, the zygote is a single cell. Through cleavage, it divides into multiple cells, forming the morula, which typically consists of 16 cells.

2. **Analyzing Cytoplasm and DNA Content**:
- During the cleavage process, the cells divide without significant growth in size. This means that while the number of cells increases, the overall volume of cytoplasm does not increase proportionally.
- The DNA content, however, increases as each cell contains a complete set of DNA from the zygote.

3. **Comparing Morula to Zygote**:
- Since the morula is made up of multiple cells, it has the same amount of cytoplasm as the zygote, but the total DNA content is higher because there are more cells, each containing DNA.

4. **Conclusion**:
- Therefore, the correct statement about the morula is that it has the **same amount of cytoplasm but much more DNA than the zygote**.

5. **Final Answer**:
- The correct option is **D**: same amount of cytoplasm but much more DNA than zygote.