Arrange the various phenomena of meiosis in a correct sequence
(A) Pairing of homologous chromosomes (B) Separation of genomes (C ) Recombination between two chromosomes (D) Chaismata

Options

A. D,B,A,C
B. D,C,A,B
C. A,C,D,B
D. C,D,B,A

Answer

To arrange the various phenomena of meiosis in the correct sequence, we need to understand the stages of meiosis and the events that occur in each stage. Here’s a step-by-step breakdown:

1. **Pairing of Homologous Chromosomes (A)**: This is the first event that occurs during meiosis. It takes place in the zygotene stage of prophase I, where homologous chromosomes come together and align along their lengths.

2. **Recombination Between Two Chromosomes (C)**: After the homologous chromosomes have paired, the next step is recombination or crossing over. This occurs during the pachytene stage of prophase I, where segments of DNA are exchanged between the homologous chromosomes, increasing genetic diversity.

3. **Chiasmata Formation (D)**: Following recombination, the points where the chromosomes have crossed over and exchanged genetic material are called chiasmata. This occurs in the diplotene stage of prophase I, where the homologous chromosomes begin to separate but remain connected at the chiasmata.

4. **Separation of Genomes (B)**: Finally, the separation of the genomes occurs during the diakinesis stage of prophase I. At this point, the homologous chromosomes are fully prepared to be pulled apart during the subsequent stages of meiosis.

Putting these events in order, we have:
- A (Pairing of homologous chromosomes)
- C (Recombination between two chromosomes)
- D (Chiasmata)
- B (Separation of genomes)

Thus, the correct sequence is **A, C, D, B**.