The correct statement about meiosis is:
b: At the end of Meiosis I, one diploid cell has become two haploid cells, and at the end of Meiosis II, two haploid cells have become four haploid cells.
Here's a brief clarification of the process:
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Meiosis I: A diploid cell (2n) divides to produce two haploid cells (n). Each of these haploid cells contains half the number of chromosomes, but they are still in duplicated form (sister chromatids).
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Meiosis II: The two haploid cells from Meiosis I undergo division again, resulting in a total of four haploid cells (n). In this phase, the sister chromatids are separated into different cells.
Therefore, option b accurately describes the outcomes of meiosis.