After meiosis - I, the two chromatids of a chromosome are :-

Options

A. Genetically similar
B. Genetically different
C. There occurs only one chromatid in each chromosome
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of four haploid cells from one diploid cell. It consists of two successive divisions: Meiosis I and Meiosis II.

2. **Meiosis I Overview**: During Meiosis I, homologous chromosomes (each consisting of two sister chromatids) are separated into different cells. This phase is known as reductional division because it reduces the chromosome number from diploid (2n) to haploid (n).

3. **Chromatid Behavior in Meiosis I**: At the end of Meiosis I, each daughter cell receives one chromosome from each homologous pair. Importantly, the sister chromatids of each chromosome remain attached to each other during this phase.

4. **Genetic Variation**: The process of crossing over (exchange of genetic material between homologous chromosomes) occurs during prophase I of meiosis. This means that the chromatids can carry different genetic information after this exchange.

5. **Conclusion**: Therefore, after Meiosis I, the two chromatids of a chromosome are genetically different due to the crossing over that occurred earlier in Meiosis I.

**Final Answer**: The two chromatids of a chromosome after Meiosis I are genetically different.

---