Haploid organisms have one genome, diploid organisms have two homologous sets, polyploid organisms have many sets sometimes form the same ancestor (autopolyploids) and sometimes from different ancestor (allopolyploids).

• 单倍体生物有一个基因组；二倍体生物有两个同源的基因组；多倍体生物有多个基因组，它们可能源于同一祖先（同源多倍体），也可源自不同的祖先（异源多倍体）。