In human beings, the correct sequence of events during reproduction is

Options

A. gamete formation, fertilisation, zygote, embryo
B. embryo, zygote, fertilisation, gamete formation
C. fertilisation, gamete formation, embryo, zygote
D. gamete formation, fertilisation, embryo, zygote

Explanation

To answer the question regarding the correct sequence of events during reproduction in human beings, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Gamete Formation (Gametogenesis)**:
- In humans, gametes are formed through a process called gametogenesis.
- Males produce sperm cells, while females produce egg cells (ova).

2. **Fertilization**:
- The next step occurs when a sperm cell successfully fuses with an egg cell.
- This fusion of gametes is known as fertilization.

3. **Zygote Formation**:
- The result of fertilization is the formation of a single cell called a zygote.
- The zygote contains genetic material from both parents.

4. **Embryo Development**:
- The zygote undergoes multiple rounds of cell division and development, leading to the formation of an embryo.
- The embryo continues to grow and develop into a fetus over time.

### Correct Sequence:
Thus, the correct sequence of events during reproduction in human beings is:
1. Gamete Formation
2. Fertilization
3. Zygote Formation
4. Embryo Development

### Conclusion:
The correct answer is that the sequence starts with gamete formation, followed by fertilization, then zygote formation, and finally embryo development.