Meiosis+ll

Meiosis ll – Sister Chromatids Separate



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In any case, meiosis ll is essentially the same as mitosis. The important difference is that meiosis ll starts with a haploid cell. = · Prophase ll: = In organisms having an interphase after meiosis l, the chromosomes condense again and the nuclear envelope breaks down during prophase ll. During prophase ll, a spindle forms and moves the chromosomes toward the middle of the cell. If needed, the nuclear membrane and nuclei break up while the spindle "network" appears and the chromosomes begin migrating to the metaphase II plate.



= · Metaphase ll: = During metaphase ll, the chromosomes are aligned on the metaphase plate as they are in mitosis, with the kinetochores of the sister chromatids of each chromosome pointing toward opposite poles.



= · Anaphase ll: = In anaphase ll, the centromeres of sister chromatids finally separate, and the sister chromatids of each pair, now individual daughter chromosomes, move toward opposite poles of the cell.



 = · Telophase ll and Cytokinesis: = In telophase ll, nuclei form at the cell poles, and cytokinesis occurs at the same time. There are now four daughter cells, each with haploid number of chromosomes.



= At the end of meiosis II, there are four daughter cells each with one half the number of chromosomes of the original parent cell. =