Briefly describe what happens during meiosis 1 and meiosis 2

Answer AND Explanation:

Meiosis consists of two successive divisions which are designated meiosis I and meiosis II. During prophase I, homologous chromosomes lie side by side and become intertwined. The nucleolus disappears and centrioles become arranged at opposite sides of the nucleus. In metaphase I, the homologous chromosomes still associated as bivalents move to the equator of the spindles. They attach to the spindles by their centromeres such that two homologous chromosomes orientate towards opposite poles. In anaphase I, the homologous chromosomes separate from one another and migrate to the opposite poles. In telophase I, when the chromosomes reach their respective poles the cell divides across the middle. The daughter cells may undergo a short interphase before proceeding to meiosis II.

In prophase II, chromosomes become shorter and thicker. A new spindle apparatus is formed. Metaphase II, the chromosomes move to the equator of the spindle and attach to the spindle fibre at their centromeres. The chromosomes orientate themselves towards the opposite poles. Anaphase II, the sister chromatids separate from each other and move to the opposite poles pulled by shortening of the spindle fibres. Telophase II, the spindle apparatus disappears. A new nuclear membrane is formed around each set of chromatids. The chromatids uncoil and the cell divides into two.

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