Question
Explain meiosis-II in an animal cell.

Answer

All these happen in the two haploid nuclei simultaneously.
i. Prophase-II takes a 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 align at the equator and spindle is formed. The centromere of every chromosome is joined to the spindle fibre and centromere also divides.
iii. Anaphase-II The daughter chromosomes are formed. Chromatids move towards their poles with the spindle fibres.
iv. Telophase-II Reaching the poles, chromosomes from nuclei which are haploid (n) daughter nuclei. Again nuclear membrane is constructed. Nucleolus now becomes clearly visible.
v. Cytokinesis Occurs and four daughter cells are formed which are haploid (n). It may occur once or twice (i.e., in meiosis-I and II) or only after the meiosis-II cell division.

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