During the last step of meiosis I (i.e., telophase I) the ploidy is reduced from diploid (2n) to haploid (n) cells.
The expression ploidy level is used in the genetics field to make reference to the set (or number of equal groups) of homologous chromosomes present in a cell.
During Meiosis I the homologous chromosomes separate to generate two cells with a n (haploid) number of chromosomes, whereas the sister chromatids of each chromosome separate during Meiosis II.
In consequence, the chromosome number is maintained across successive rounds of Meiosis and it also leads to a change in the ploidy level from diploid 2n cells (Meiosis I) to haploid n cell (Meiosis I), which is the result of the final process, i.e., 4 haploid cells having half genetic material after Meiosis.
In conclusion, during the last step of meiosis I (i.e., telophase I) the ploidy is reduced from diploid (2n) to haploid (n) cells.
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