Plants derived from vegetative organs (stems, roots, leaves) of a single parent plant are called clones because they are genetically identical to the parent and to each other. Vegetative propagation uses mitotic cell division, producing offspring without meiosis or fertilization, so no genetic recombination occurs. Each propagule (cutting, tuber, runner, etc.) grows into a new organism with the exact same genotype as the parent plant. Polyploids have extra chromosome sets, hybrids are offspring of genetically different parents, and haploids have half the normal chromosome number - none of these describe the genetic uniformity characteristic of vegetative propagation.