Bud-variations, such as the appearance of a moss-rose on a common rose, or of a nectarine on a peach-tree, offer good instances of spontaneous variations;
Arrosa-landare arruntean goroldio-arrosa bat edo melokotoi arbolan brinoi bat agertzea bezalako kimuz aldatzeek berezko aldakuntzen adibide onak eskaintzen dizkigute;