Budding is a type of asexual reproduction in which a new individual develops as an outgrowth (a bud) from the body of the parent. The bud is formed by mitosis, so it is genetically identical to the parent.Yeast (a single-celled fungus): a small bulge forms on the side of the parent cell. The nucleus divides by mitosis and one of the daughter nuclei moves into the bud, along with some cytoplasm and organelles. The bud grows and is then separated by a new cell wall forming across the narrow neck between them. Unlike binary fission, the division of the cytoplasm is unequal: the bud starts much smaller than the parent. Sometimes buds stay attached and bud again, forming chains of cells. Each division leaves a bud scar on the parent's cell wall.Hydra (a small freshwater animal related to jellyfish): a group of cells in the body wall divides repeatedly by mitosis to form a bud. The bud grows tentacles and a mouth, becomes a small but complete Hydra, and then detaches from the parent to live independently.
Budding lets a population increase quickly when food is plentiful. For example, in good conditions a yeast cell can bud roughly every 90 minutes. If every cell keeps budding, one cell could give rise to 24 = 16 cells in 6 hours.As with all asexual reproduction, budding gives little genetic variation. Yeast and Hydra can both also reproduce sexually, which they tend to do when conditions become unfavourable.
Budding lets a population increase quickly when food is plentiful. For example, in good conditions a yeast cell can bud roughly every 90 minutes. If every cell keeps budding, one cell could give rise to 24 = 16 cells in 6 hours.As with all asexual reproduction, budding gives little genetic variation. Yeast and Hydra can both also reproduce sexually, which they tend to do when conditions become unfavourable.