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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.
Discuss with your teacher about some haploid cells in higher plants where cell-division does not occur.
Choose the correct option.
Synapsis is pairing of ______.
Spindle apparatus is formed during which stage of mitosis?
Anaphase promoting complex APC is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in human cell, which of the following is expected to occur?
In meiosis crossing over is initiated at ______.
Write about Pachytene and Diplotene of Prophase I
If a tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single cell undergone?
An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?
Name the pathological condition when uncontrolled cell division occurs.
