Reduction division The first division of meiosis , including prophase, metaphase I, and anaphase I.It results in a haploid number of chromosomes gathering at each end of the nuclear spindle.

• 减数分裂：减数分裂中的第一次分裂，包括分裂前期，中期I和后期I，形成单倍数目的染色体在每一个核纺锤体末端聚集。