In meiosis, two sets of chromosomes are divided among four nuclei, each of which then has half as many chromosomes as the original cell. Four haploid cells are the result of two successive nuclear divisions. The micrographs show meiosis in the male reproductive organ of a lily; the diagrams show corresponding phases in an animal. (For instructional purposes, the chromosomes from one parent are colored blue and those from the other parent are red.)
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