Offspring formed by asexual method of reproduction have greater similarity among themselves because
(i) Asexual reproduction involves only one parent
(ii) Asexual reproduction does not involve gametes
(iii) Asexual reproduction occurs before sexual reproduction
(iv) Asexual reproduction occurs after sexual reproduction

Options

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iv)
D. (iii) and (iv)

Explanation

To answer the question regarding why offspring formed by asexual reproduction have greater similarity among themselves, we can analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Asexual Reproduction**:
- Asexual reproduction is a mode of reproduction that involves only one parent. This means that the offspring are produced without the fusion of gametes (sperm and egg).

2. **Analyzing the Options**:
- **Option (i)**: "Asexual reproduction involves only one parent."
- This statement is true. Since there is only one parent, the genetic material is identical to that of the parent, leading to greater similarity among the offspring.

- **Option (ii)**: "Asexual reproduction does not involve gametes."
- This statement is also true. In asexual reproduction, there is no fusion of gametes, which means that the offspring inherit the same genetic material from the single parent, resulting in less genetic variation.

- **Option (iii)**: "Asexual reproduction occurs before sexual reproduction."
- This statement is not universally true. Asexual and sexual reproduction are two different modes that can occur independently in various organisms. The timing of these processes does not inherently affect the similarity of offspring.

- **Option (iv)**: "Asexual reproduction occurs after sexual reproduction."
- Similar to option (iii), this statement is also not universally applicable. The occurrence of asexual reproduction does not depend on sexual reproduction, and the timing does not influence the genetic similarity of the offspring.

3. **Conclusion**:
- The correct reasons for the greater similarity among offspring produced by asexual reproduction are found in options (i) and (ii). Therefore, the offspring formed by asexual reproduction have greater similarity among themselves because:
- (i) Asexual reproduction involves only one parent.
- (ii) Asexual reproduction does not involve gametes.

### Final Answer:
The offspring formed by asexual method of reproduction have greater similarity among themselves because:
- (i) Asexual reproduction involves only one parent.
- (ii) Asexual reproduction does not involve gametes.