At which stage of meiosis does the genetic constitution of gametes is finally decided?

Options

A. Metaphase-I
B. Anaphase-II
C. Metaphase-II
D. Anaphase-I

Explanation

**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 gametes (sperm and eggs). It consists of two main stages: Meiosis I and Meiosis II.

2. **Identifying Key Stages**: In Meiosis I, there are several phases: Prophase I, Metaphase I, Anaphase I, and Telophase I. Similarly, Meiosis II consists of Prophase II, Metaphase II, Anaphase II, and Telophase II.

3. **Focus on Anaphase I**: The question specifically asks when the genetic constitution of gametes is finally decided. This occurs during Anaphase I of Meiosis I.

4. **Chromosome Separation**: During Anaphase I, homologous chromosomes (each consisting of two sister chromatids) are separated and pulled towards opposite poles of the cell. This is crucial because it determines which alleles (gene variants) will be present in the resulting gametes.

5. **Haploid Condition**: After Anaphase I, the daughter cells will have half the number of chromosomes compared to the parent cell. If the parent cell is diploid (2n), the daughter cells will be haploid (n), which is the genetic constitution of the gametes.

6. **Conclusion**: Therefore, the genetic constitution of gametes is finally decided at Anaphase I of Meiosis I.

**Final Answer**: The genetic constitution of gametes is finally decided at Anaphase I of Meiosis.

---