. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Fig. I. Asexual reproduc- tion. ( I ) Fission as it occurs in amoebae and bacteria. (2) Budding in yeast. (3) Filamentous growth in molds. (4) Fragmentation in Plasmodium malariae. (5) Nonceilular growth in the myxomycetes. Plastic cells ^;;^ Rigid < 2 Budding 3 Filamentous growth 4 Frogmentotlon 5 Non-cellulor growth. rapidly to the approximate size of the mother and finally constricts off. It may separate completely from the mother or may remain attached. In the latter ca
. Animal growth and development. Embryology; Growth; Biology; Growth; Embryology; Animals -- growth & development. Fig. I. Asexual reproduc- tion. ( I ) Fission as it occurs in amoebae and bacteria. (2) Budding in yeast. (3) Filamentous growth in molds. (4) Fragmentation in Plasmodium malariae. (5) Nonceilular growth in the myxomycetes. Plastic cells ^;;^ Rigid < 2 Budding 3 Filamentous growth 4 Frogmentotlon 5 Non-cellulor growth. rapidly to the approximate size of the mother and finally constricts off. It may separate completely from the mother or may remain attached. In the latter case, both mother and daughter may bud and so produce a chain of cells. This is the manner in which yeast cells divide. 3. Growth of filaments. The cells of fungi and some algae are linked together in thin hair-like fibers. Since growth can occur only at the tip of each filament, the tip elongates and a cross wall forms to yield a cell with a growing tip on its far end. Branching often occurs, when the growing tip bifurcates and both branches elongate in separate strands. 4. Fragmentation. The animal parasite, Plasmodium malariae, is one of a number of microorganisms that reproduce by fragmentation. The Plasmodium grows inside a red blood cell. The parent nucleus divides or fragments into as many as 24 daughter nuclei and the cytoplasm coalesces about each of them. Separate walls are formed around the conglomerates of nucleus and cytoplasm, which are now called merozoites. The host red cell ruptures and releases the merozoites and each can now infect another red blood cell. (Incidentally, the well-known chills and fever of malaria are associated with the simultaneous release of merozoites from many blood cells.) The term fragmentation is a bit misleading because the parent organism does not break up into incomplete fragments, each of which reconstitutes a whole new organism. Rather it is as if a bacterium would synthesize enough protoplasm to create many new cells instead of just
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