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Which is the correct order of phases ?
- a)Leptotene, diakinesis, pachytene, diplotene,zygotene
- b)Leptotene, zygotene, pachytene, diplotene,diakinesis
- c)Diakinesis, diplotene, pachytene, zygotene, leptotene
- d)Leptotene, pachytene, zygotene, diplotene,diakinesis
Correct answer is option 'B'. Can you explain this answer?
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Which is the correct order of phases ?a)Leptotene, diakinesis, pachyte...
Order of Phases in Meiosis
Leptotene
- This is the first stage of meiosis.
- During leptotene, chromosomes start to condense and become visible under a microscope.
- The chromosomes appear as thin threads, and homologous chromosomes start pairing up.
Zygotene
- In this stage, homologous chromosomes start to pair up completely.
- This process is called synapsis, and it results in the formation of bivalents or tetrads.
- The chromosomes continue to condense, and the paired chromosomes become visible as thicker threads.
Pachytene
- During pachytene, the chromosomes become even more condensed and shorten.
- Crossing over occurs between the paired homologous chromosomes and results in the exchange of genetic material between them.
- This exchange of genetic material increases genetic diversity.
Diplotene
- In this stage, the homologous chromosomes start to separate, but they are still linked at points called chiasmata where crossing over occurred.
- The chromosomes start to uncoil and become visible as thinner threads again.
- The nuclear envelope also starts to reform around each set of chromosomes.
Diakinesis
- This is the final stage of meiosis I.
- The chromosomes continue to condense and become visible as distinct structures.
- The nuclear envelope breaks down completely, and the spindle fibers start to attach to the chromosomes in preparation for their separation.
Correct Order of Phases in Meiosis
The correct order of phases in meiosis is:
Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis
Option B is the correct answer as it presents the phases in the correct order.
Leptotene
- This is the first stage of meiosis.
- During leptotene, chromosomes start to condense and become visible under a microscope.
- The chromosomes appear as thin threads, and homologous chromosomes start pairing up.
Zygotene
- In this stage, homologous chromosomes start to pair up completely.
- This process is called synapsis, and it results in the formation of bivalents or tetrads.
- The chromosomes continue to condense, and the paired chromosomes become visible as thicker threads.
Pachytene
- During pachytene, the chromosomes become even more condensed and shorten.
- Crossing over occurs between the paired homologous chromosomes and results in the exchange of genetic material between them.
- This exchange of genetic material increases genetic diversity.
Diplotene
- In this stage, the homologous chromosomes start to separate, but they are still linked at points called chiasmata where crossing over occurred.
- The chromosomes start to uncoil and become visible as thinner threads again.
- The nuclear envelope also starts to reform around each set of chromosomes.
Diakinesis
- This is the final stage of meiosis I.
- The chromosomes continue to condense and become visible as distinct structures.
- The nuclear envelope breaks down completely, and the spindle fibers start to attach to the chromosomes in preparation for their separation.
Correct Order of Phases in Meiosis
The correct order of phases in meiosis is:
Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis
Option B is the correct answer as it presents the phases in the correct order.
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Which is the correct order of phases ?a)Leptotene, diakinesis, pachyte...
Option b....(refer ncert)
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