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प्रश्न
Write about Pachytene of Prophase I.
उत्तर
Pachytene: At this stage, bivalent chromosomes are clearly visible as tetrads. Bivalent of meiosis I consist of 4 chromatids and 2 centromeres. Synapsis is completed and recombination nodules appear at a site where crossing over takes place between non – sister chromatids of the homologous chromosomes. Recombination of homologous chromosomes is completed by the end of the stage but the chromosomes are linked at the sites of crossing over. This is mediated by the enzyme recombinase.
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संबंधित प्रश्न
Discuss with your teacher about haploid insects and lower plants where cell-division occurs.
Can there be DNA replication without cell division?
Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:
Lumen, muscular tissue, connective tissue, pericardium
Choose the correct option.
Synapsis is pairing of ______.
Choose the correct option.
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Choose the correct option.
In which of the following phase of mitosis chromosomes are arranged at the equatorial plane?
The paring of homologous chromosomes on meiosis is known as ______.
Write any three significance of mitosis.
Differentiate cytokinesis in plant cells and animal cells.
An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?
