Phases of metosis kya hai

Mitosis, ek prakriya hai jisse ek eukaryotic koshika apne aapko do samankhya koshikon mein vibhajit karti hai. Mitosis ke chaar pramukh avasthaayein hoti hain: 1. **Prophase (Prarambhik avastha)**: - Is avastha mein, koshika ka DNA khrigat (condense) ho jata hai aur chromosomes ban jate hain. - Har chromosome do sister chromatids mein vibhajit hota hai, jo centromere ke madhyam se jude hote hain. - Karyotype (nuclear envelope) dhundhla hona shuru hota hai aur spindles (kendra dhanu) ka nirmaan hota hai. 2. **Metaphase (Madhya avastha)**: - Is avastha mein, chromosomes ek line mein kendra ke kshetra mein pichhe khade hote hain, jise metaphase plate kehte hain. - Spindle fibers, jo centrosomes se nikalte hain, chromosomes ke centromeres se jure hote hain. 3. **Anaphase (Antavavasta)**: - Is avastha mein, sister chromatids ek dusre se alag hote hain aur opposite poles ki taraf kheechte hain. - Har sister chromatid ab ek alag chromosome ban jata hai. 4. **Telophase (Antim avastha)**: - Is avastha mein, chromosomes poles tak pahunchaate hain aur dhire-dhire phir se khulne lagte hain, nuclear envelope daura se ban jata hai. - Cytokinesis ka prakriya shuru hota hai, jisme koshika ke cytoplasm do alag koshikon mein vibhajit hota hai. Yeh char avasthaayein milkar mitosis ki prakriya ko pura karti hain, jo ek koshika ko do samankhya koshikon mein vibhajit karne me madad karti hai.