MEIOSIS OR REPRODUCTION DIVISION _ PART 02 |
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Written by punjalak
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Friday, 15 August 2014 04:41 |
The key features of meiosis are. 1 Meiosis involves two sequential cycles of nuclear cell division called Meiosis I and Meiosis II but only a single cycle of DNA replication occurs. 2 Meiosis- I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S-phase of interphase. 3 Meiosis involves pairing of homologous chromosomes & recombination between them. 4 Four haploid cells are formed at the end of Meiosis -- II.MEIOSIS- is divided in two; 1 Meiosis I. 2 Meiosis II MEIOSIS-I is further divided into 1 Karyokinesis -- l ,2 Cytokinesis MEOSIS II - is further divided into 1Karyokinesis II, 2 Cytokinesis Karyokinesis-l: Occurs in four stages Prophase -- I Metaphase - I Anaphase - I Telophase - I Prophase- Iagain has 5 stages Leptotene Zygotene Pachytene Diplotene Diakinesis KARYOKINESIS II- has 4 stages Prophase --II Metaphase --II Anaphase --II Telophase -- II
ที่มา : http://www.youtube.com/channel/UCflmr7Tyyy38MaAENetim_g อัพโหลดโดย 7activestudio
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