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प्रश्न
Write the significance of crossing over.
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उत्तर
Significance of Crossing over:
- As a result of crossing over, the paternal and maternal homologous chromosomes of an organism pair up and exchange certain portions of their chromatids, which lead to genetic variations.
- It makes the genetic information in each haploid cell unique.
संबंधित प्रश्न
Define the following:
Chiasmata
How prophase-I of meiosis differs from prophase of mitosis in an essential way? Describe how it affects the daughter cells?
What is the importance of chiasma formation?
Name the Following
The process is responsible for the variation.
What is terminalization?
What is the bouquet stage?
What is zygotene?
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:
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
