"कोशिका विभाजन" के अवतरणों में अंतर

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टैग: किए हुए कार्य को पूर्ववत करना मोबाइल संपादन मोबाइल वेब सम्पादन उन्नत मोबाइल सम्पादन
कोशिका विभाजन की प्रक्रिया कई प्रकार की होती है। प्रोकैरियोटिक कोशिकाओं का विभाजन यूकैरियोटिक कोशिकाओं से भिन्न होता है।
The sequence of phases in cell cycle is G<sub>1</sub>, S, G<sub>2</sub> and M phase. It means the life cycle of a cell involves two distinct phases
(1) '''Interphase (non–dividing period) :''' Biologists divide interphase into three distinct periods on the basis of synthetic activities
(a) '''Post–mitotic or first growth period''' (G<sub>1</sub>–period) ''':''' The young daughter cell grows in size during this period. Its duration is most variable and the non–dividing cells remain permanently in this stage.
(b) '''Synthetic period''' (S–period) ''':''' It is characterised by the replication of DNA. A diploid cell during this phase has double the amount of DNA (''i.e.'' 4''n''). Histones are also synthesized so that two chromatids are formed in each chromosome. Time taken in 30-50% of cell cycle.
(c) '''Premitotic or second growth period''' (G<sub>2</sub> period) ''':''' It is characterised by increased nuclear volume. During its certain metabolic activities occur as a prerequisite of cell division. Time taken is 10-20%.
'''[https://madanacademy.com FOR MORE INFORMATION CLICK HERE]'''
== साधारण कोशिका विभाजन अथवा समसूत्रण (mitosis)==