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Meiosis II reduces the amount from 2C to C in gametes and when these gametes get fused the amount of DNA become again 2C. Thus meiosis II helps keep DNA amount fix generation to generation.

Meiosis is the production of four genetically diverse haploid daughter cells from one diploid parent cell. ... Homologous pairs of cells are present in meiosis I and separate into chromosomes before meiosis II . In meiosis II , these chromosomes are further separated into sister chromatids