Stages in proper sequence of prophase I area)Zygotene, Leptotene, Pachytene, Diakinesis and Diploteneb)Leptotene, Zygotene, pachytene, Diplotene and Diakinesisc)Leptotene, Pachytene, Zygotene, Diakinesis and Diplotened)Diplotene, Diakinesis, Pachytene, Zygotene and LeptoteneCorrect answer is option 'B'. Can you explain this answer?

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Answer

Given in Ncert..Learn this by using mnemonic -->Lalu Zaye Plane se Deepika Dekhe .. Leptotene -->Zygotene -->Pachytene-->Diplotene-->Diakinesis.

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Sequence of Prophase I in Meiosis

The prophase I stage of meiosis can be divided into five sub-stages: leptotene, zygotene, pachytene, diplotene, and diakinesis. The correct sequence of these sub-stages is:

Leptotene
Zygotene
Pachytene
Diplotene
Diakinesis

1. Leptotene
During this sub-stage, the chromosomes begin to condense and become visible under a microscope. Each chromosome appears as a single thread-like structure.

2. Zygotene
In this sub-stage, the homologous chromosomes pair up and become aligned side by side. This pairing process is called synapsis, and the paired chromosomes are called bivalents or tetrads.

3. Pachytene
During this sub-stage, the chromosomes continue to condense and become shorter and thicker. Crossing over occurs between the paired homologous chromosomes, where segments of DNA are exchanged between the chromosomes. This genetic recombination increases genetic diversity.

4. Diplotene
In this sub-stage, the paired homologous chromosomes begin to separate, but remain connected at points called chiasmata, where crossing over occurred. The chromosomes uncoil slightly, allowing some regions to be visible as two chromatids.

5. Diakinesis
During this sub-stage, the chromosomes become fully condensed and the nuclear envelope breaks down. The chiasmata move towards the ends of the chromosomes, and the spindle fibers begin to attach to the kinetochores on the chromosomes.

Conclusion

The correct sequence of prophase I is Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis. Each sub-stage has its own unique events that occur, leading to the formation of four genetically diverse daughter cells.

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Similar NEET Doubts

Stages in proper sequence of Prophase I are

Which is the correct order of phases ?

“The synaptonemal complex is formed during A stage and dissolves during B stage”.Complete the above statement by choosing the correct option for A and B.

In which stage of meotic prophase 1 chromosomes become thread like and visible?

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