(1) A type of asexual reproduction in small, single-celled organisms. A process in which a process emerges from an individual cell, which gradually grows until it reaches a certain size and separates from the main body to become a new individual. This is seen in yeasts and testate amoebae. (2) In lower multicellular animals, a small process called a bud emerges from part of an individual, which then grows into a shape similar to the original individual and becomes independent. (3) In plants, branching occurs from an axis, which produces a new axis primordium and grows. If this bud is cut off, asexual reproduction occurs. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
(1) 小単細胞生物の無性的な生殖の一つの型。ある個体細胞から突起を生じ,それが次第に大きくなって,ある程度の大きさに達したとき,本体から離れて新個体となるもの。酵母菌類および有殻アメーバ類にみられる。 (2) 下等の多細胞動物において個体の一部に芽体という小突起を生じ,それが原個体と同様な形に成長して独立すること。 (3) 植物体において軸から分岐が起り,新しい軸の原基を生じて生長すること。この芽を切り離せば無性的な生殖となる。
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