A cell with half the number of chromosomes is called a haploid cell.

Here's why:

* Diploid cells have two sets of chromosomes, one from each parent.

* Haploid cells have only one set of chromosomes.

Haploid cells are involved in sexual reproduction, where they combine to form a diploid zygote. Examples of haploid cells include:

* Sperm cells in males

* Egg cells in females

* Spores in some plants and fungi