Definition
Chances are, you look like one or both of your biological parents. This is because you inherited half of your chromosomes from your mother and half from your father. Chromosomes are bundles of DNA, each containing genes that code for your physical, behavioral, and functional traits and characteristics. Organisms that are tetraploid have four times the regular number of chromosomes.
Different species of organisms have different numbers of chromosomes, and the gametes of sexually-reproducing organisms, or sex cells like eggs and sperm, each contain half of the total number. This is so that when gametes come together during fertilization, the offspring gets a complete set. A cell containing half the number of total possible chromosomes, like gametes, is said to be haploid (n), while a cell containing the full number is diploid (2n).