Meiosis. Cross-section through a lily (Lilium sp.) anther showing cells undergoing the first meiotic division. During meiosis (gamete formation) four daughter nuclei are formed from one parent nucleus after two stages of nuclear division. Meiosis occurs only in the sex cells (gametes). The majority of the cells seen here are in anaphase (I), when pairs of homologous chromosomes (purple) are separated and pulled to opposite poles of the cell by spindles.
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