The genetic diversity arising from meiosis results from:

Options

A. replication of DNA during Interphase
B. mixing of maternal and paternal chromatids during meiosis II
C. crossing-over during prophase
D. both (b) and ©

Answer

To answer the question about the genetic diversity arising from meiosis, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Meiosis**:
- Meiosis is a type of cell division that reduces the chromosome number by half and leads to the production of gametes (sperm and egg cells). It consists of two rounds of division: meiosis I and meiosis II.

2. **Option A: Replication of DNA during interphase**:
- During the interphase, specifically the S phase, DNA replication occurs. However, this process does not contribute to genetic diversity. It simply duplicates the genetic material. Therefore, this option is **not correct**.

3. **Option B: Mixing of maternal and paternal chromatids during meiosis II**:
- While there is mixing of chromatids during meiosis II, this mixing does not significantly contribute to genetic diversity. The major sources of genetic variation occur earlier in meiosis, particularly during meiosis I. Thus, this option is also **not correct**.

4. **Option C: Crossing over during prophase I**:
- Crossing over occurs during the pachytene stage of prophase I of meiosis. This process involves the exchange of genetic material between non-sister chromatids of homologous chromosomes. This exchange results in new combinations of alleles, contributing significantly to genetic diversity. Therefore, this option is **correct**.

5. **Option D: Both B and C**:
- Since option B is not correct, option D, which includes B, cannot be correct either. Thus, this option is also **not correct**.

### Conclusion:
The correct answer to the question is **C: Crossing over during prophase I**.