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Question
Differentiate between
Chiasmata and crossing over.
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Solution
| Chiasmata | Crossing Over |
| It is the part of the attachment of non-sister chromatids of homologous chromosomes where crossing over takes place. | It is exchange of genetic material between non-sister chromatids of homologous chromosomes. |
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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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Statement I: Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:
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 |
Choose the correct answer from the options given below:
