In nature, clones are derived from a single parental organism or cell by mitotic cell division, asexual reproduction, or parthenogenesis. 在自然條件下來(lái)源于有絲分裂所產(chǎn)生的單個(gè)親本細胞或生物體，還可能來(lái)源于無(wú)性繁殖或單性生殖。
Two diploid gametes may fuse to give a tetraploid zygote, or gamete may develop directly by parthenogenesis. 兩個(gè)二倍體配子融合可能產(chǎn)生一個(gè)四倍體合子，這樣的配子也可以通過(guò)孤雌生殖直接發(fā)育而來(lái)。
However, reproduction is often by parthenogenesis since polyploid animals are often sterile. 然而，它們常常是通過(guò)孤雌生殖繁殖的，因為多倍體動(dòng)物往往不育。
