When a small piece of dorsal lip of blastopore of frog's early gastrula is transplanted into another gastrula of similar ageat ventral lip, the result is

Options

A. Death of the graft tissue
B. The host gastrula undergoes abnormal development
C. The host gastrula remains normal and unaffected
D. The graft tissue induces development of another notochord in the host

Explanation

To solve the question regarding the transplantation of a small piece of the dorsal lip of the blastopore from a frog's early gastrula into the ventral lip of another gastrula of similar age, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Gastrula Stage**:
- The gastrula is a stage in embryonic development where the three germ layers (ectoderm, mesoderm, and endoderm) are formed. The dorsal lip of the blastopore is crucial for organizing the development of these layers.

**Hint**: Remember that the dorsal lip of the blastopore plays a key role in the development of the embryo.

2. **Transplantation Procedure**:
- In this experiment, a small piece of the dorsal lip from one gastrula is transplanted into the ventral lip of another gastrula. This is a critical manipulation to observe the effects of the graft.

**Hint**: Think about what happens when you introduce new tissue into a developing embryo.

3. **Expected Outcome of the Graft**:
- The dorsal lip of the blastopore contains cells that have the ability to induce the formation of a notochord, which is essential for the development of the nervous system and the axial skeleton.

**Hint**: Consider the role of the notochord in embryonic development and how it might be influenced by the graft.

4. **Induction of Development**:
- The graft tissue (dorsal lip) will induce the host gastrula to develop a new notochord. This is a well-documented phenomenon in embryology, showing that certain tissues can influence the development of surrounding tissues.

**Hint**: Reflect on the concept of induction in developmental biology, where one tissue influences the fate of another.

5. **Conclusion**:
- Based on the above understanding, the result of this transplantation is that the graft tissue induces the development of another notochord in the host gastrula.

**Final Answer**: The correct answer is option D: "The graft tissue induces development of another notochord in the host."