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Question
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
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Solution
The correct option is D Diakinesis
The prophase I of meiosis I includes five phases:
Leptotene: Compaction of chromosomes.
Zygotene: Pairing of homologous chromosomes.
Pachytene: Crossing over between the non-sister chromatids of the homologous chromosomes, leading to recombination of genetic material.
Diplotene: The recombined homologous chromosomes tend to separate from each other due to the dissolution of the synaptonemal complex except at the site of crossovers. These X-shaped structures are called chiasmata.
Diakinesis: Terminalisation of chiasmata. The displacement of chiasmata is termed as terminalisation.
The prophase I of meiosis I includes five phases:
Leptotene: Compaction of chromosomes.
Zygotene: Pairing of homologous chromosomes.
Pachytene: Crossing over between the non-sister chromatids of the homologous chromosomes, leading to recombination of genetic material.
Diplotene: The recombined homologous chromosomes tend to separate from each other due to the dissolution of the synaptonemal complex except at the site of crossovers. These X-shaped structures are called chiasmata.
Diakinesis: Terminalisation of chiasmata. The displacement of chiasmata is termed as terminalisation.
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