The process by which haploid cells are produced from diploid cells is called meiosis.
Meiosis is a process of cell division through which four haploid cells are produced from one diploid cell.
In other words, it consists of the division of a diploid cell (2n), that is, provided with two sets of chromosomes to give rise to four haploid cells (n), provided with a single set of chromosomes, that is, half of the genetic makeup of the initial cell.
Therefore, we can conclude that process by which haploid cells are produced from diploid cells is called meiosis.
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