Fusion of gametes produces blastocyst.

Answer

To determine whether the statement "Fusion of gametes produces blastocyst" is true or false, we can break down the concepts involved in sexual reproduction and the development of embryos.

### Step-by-Step Solution:

1. **Understanding Gametes**:
- Gametes are the reproductive cells involved in sexual reproduction. In humans and many other organisms, there are two types of gametes: sperm (male) and egg (female). Each gamete is haploid, meaning it contains one set of chromosomes (N).

2. **Fusion of Gametes**:
- When a sperm and an egg fuse during fertilization, they form a zygote. This process is known as fertilization and marks the beginning of a new organism's development.

3. **Formation of Zygote**:
- The zygote is diploid (2N) because it contains two sets of chromosomes: one from the sperm and one from the egg. This zygote undergoes several rounds of cell division (cleavage) as it begins to develop.

4. **Development into an Embryo**:
- As the zygote divides and develops, it forms a multicellular structure known as an embryo. This stage involves various developmental processes that lead to the formation of different tissues and organs.

5. **Formation of Blastocyst**:
- In mammals, after several divisions, the embryo reaches a stage called the blastocyst. The blastocyst is a hollow structure that forms a few days after fertilization and is crucial for implantation in the uterine wall.

6. **Conclusion**:
- The statement "Fusion of gametes produces blastocyst" is **false**. The fusion of gametes produces a zygote, which then develops into an embryo, and eventually into a blastocyst during the early stages of development.

### Final Answer:
The statement is **false**.