BIOL 1000 Lecture Notes - Lecture 22: Sister Chromatids, Spindle Apparatus, Cleavage Furrow

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Biology lecture 22: division in meiosis occurs in the same four phases except they have 1 attached to them in the first part and 2 in the second part. It is in meiosis that you go from 2n to n. Prophase i: prophase i typically occupies more than 90 percent of time, chromosomes begin to condense. In synapsis, homologous chromosomes loosely pair up, aligned gene by gene** e. g eye colour and toe nail genes lined up side by side. Anaphase i: pairs of homologous chromosomes separate, one chromosome moves toward each pole guided by the spindle apparatus, **sister chromatids remain attached at the centromere and move as one unit toward the pole. In beginning each half of cell has a haploid set of chromosomes, each chromosome still consists of two sister chromatids: cytokinesis usually occurs simultaneously forming two haploid daughter cells, 2 cells formed will have 1n double stranded. So we went from 2n double stranded to 1n double stranded.

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