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Explain meiosis II in an animal cell.

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Meiosis II happen in the two haploid nuclei simultaneously. 

(i) Prophase II: It takes short time. Spindle formation begins and the chromosomes become short. Two chromatids are joined to a single centromere. Nuclear membrane and nucleolus disintegrate. 

(ii) Metaphase II : At the equator, the chromosomes lie and spindle is formed. The centromere of every chromosome is joined to the spindle fibre. Then centromere also divides. 

(iii) Anaphase II : The daughter chromosomes are formed. Chromatids move towards their poles with the spindle fibres. 

(iv) Telophase II: Reaching at the poles chromosomes form nuclei which are haploid (N) daughter nuclei. Again nuclear membrane is constructed. Nucleolus is clearly visible.

Cytokinesis: The cytokinesis occurs and four daughter cells are formed which are haploid (N). It may occur once or twice (i.e., in Meiosis I and Meiosis or only after the meiosis Ⅱ cell division).

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