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Question
What is the importance of chiasma formation?
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Solution
Chiasma is the region where crossing-over takes place. By the formation of the chiasma, the exchange of genetic material between non-sister chromatids of the homologous chromosomes is accomplished. So, chiasma is the means of bringing about recombination of characters and thus variations in multicellular organisms
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RELATED QUESTIONS
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Crossing over is a feature of _______________
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DNA replication takes place in ______________
How prophase-I of meiosis differs from prophase of mitosis in an essential way? Describe how it affects the daughter cells?
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The process is responsible for the variation.
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Crossing over occurs during the third substage of meiosis.
Multiple Choice Question:
The regions where crossing-over takes place are called
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Match List I with List II.
| List I (Sub Phases of Prophase I) |
List II (Specific characters) |
| A. Diakinesis | I. Synaptonemal complex formation |
| B. Pachytene | II. Completion of terminalisation of chiasmata |
| C. Zygotene | III. Chromosomes look like thin threads |
| D. Leptotene | IV. Appearance of recombination nodules |
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