Monozygotic twins develops from
(a) Different zygotes
(b) Different ova
(c) Different sperms
(d) Same zygote

Options

A. Different zygotes
B. Different ova
C. Different sperms
D. Same zygote.

Answer

To solve the question regarding the development of monozygotic twins, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Monozygotic Twins**:
- The term "monozygotic" indicates that these twins originate from a single zygote.

2. **Identifying the Zygote Formation**:
- A zygote is formed when a sperm fertilizes an ovum (egg). In the case of monozygotic twins, this means that one egg is fertilized by one sperm.

3. **Splitting of the Zygote**:
- After the zygote is formed, it undergoes a process called cleavage or splitting. This process results in the zygote dividing into two separate embryos.

4. **Genetic Similarity**:
- Since both twins come from the same zygote, they share identical genetic material, making them genetically identical or "monozygotic".

5. **Eliminating Incorrect Options**:
- Option (a) Different zygotes: Incorrect, as monozygotic twins come from the same zygote.
- Option (b) Different ova: Incorrect, as monozygotic twins arise from one ovum.
- Option (c) Different sperms: While multiple sperms can fertilize an egg, monozygotic twins specifically arise from one sperm fertilizing one egg.
- Option (d) Same zygote: Correct, as this is the definition of monozygotic twins.

### Conclusion:
The correct answer is (d) Same zygote.

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