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-prophase II: the nuclear envelope breaks down and the spindle fibers and centrioles appear.
-metaphase II: spindle fibers attatch to the centromeres and the chromosomes line up singularly across the middle of the cell.
-anaphase II: spindle fibers shorten and separate the chromosomes and the sister chromatids are pulled apart and moved to the opposite ends of the cell.
-telophase II and cytokinesis: spindle fibers disappear and the nuclear membrane reforms, the cell membrane pinches inward and two cells are formed.

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prophase II, metaphase II, anaphase II, telophase II, and cytokinesis

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body cells such as skin, nerve, bone that have the full number of chromosomes

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sex cells such as egg and sperm that have half the number of chromosomes

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when homologous chromosomes come very close together and exchange portions of their chromatids

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-interphase: cells grow, produce RNA, synthesize proteins, and replicate DNA.
-prophase I: nuclear envelope breaks down, spindle fibers and centrioles appear, chromosomes pair up with their homologous partner forming tetrad, and crossing over occurs between non-slit chromatids.
-metaphase I: spindle fibers attach to centromeres, and homologous chromosomes line up in pairs in the middle of the cell.
-anaphase: spindle fibers shorten and pull the chromosomes pairs apart, and a chromosome from each pair moves to the opposite end of the cell.
-telophase I and cytokinesis: spindle fibers disappear and the nuclear membrane reforms, and the cell membrane pinches inward and two haploid cells are formed

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the two sets of chromosomes that sexually reproducing organisms have

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interphase, prophase I, metaphase I, anaphase I, telophase I, and cytokinesis