The process of copying cells with half the number of chromosomes is called meiosis.

Here's a breakdown:

* Meiosis is a type of cell division that occurs in sexually reproducing organisms. It produces gametes (sperm and egg cells) which have half the number of chromosomes as the parent cell.

* This reduction in chromosome number is essential for maintaining the correct number of chromosomes in offspring.

* During meiosis, the parent cell undergoes two rounds of division (Meiosis I and Meiosis II), resulting in four daughter cells, each with half the number of chromosomes as the original cell.

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