By W. B. Crow (Auth.)
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Extra info for A Synopsis of Biology
Vacuoles if present are first pushed out of the way by the proto plasm. May form simultaneously, or as ingrowing diaphragm as in most algae. Sometimes the new cell-wall instead of being Nucleus Cytoplasm Fig. —Typical vegetable cell from inner epidermis of onion scale. a septum completely surrounds the new protoplast (free-cell formation), as in the ascus of ascomycete fungi. , adding on of new layers. If material added on is not uniform stratification may result; there is usually some indication of this.
Coccifera there are relatively large female gametes, produced by fewer divisions of the parent cell t h a n occur in the formation of the relatively smaller male gametes. OOGAMY IN ANIMALS The fusion of specialized gametes : s p e r m a t o z o a or sperm of the male (Fig. 16) and ova or eggs of the female in Parazoa and Metazoa. Fusion of the two is termed fertilization (also applied to plants). The spermatozoon differs from the ovum in (i) its smaller size, (2) its relatively small proportion of cytoplasm, (3) its flagellum, propelling it from behind (pulsellum), (4) its bilateral symmetry, and (5) in being produced in much larger numbers.
Uroglena, Synura, rounded colonial chrysomonads, although this is not the more usual method, which is sporogonous. POLYEMBRYONY Is binary or multiple fission in the embryonic state, usually a t t h e unicellular or fertilized ovum stage. I t occurs in sporadic fashion in VEGETATIVE REPRODUCTION 29 many species, and regularly in a few, of the most diverse groups. I d e n t i c a l t w i n s in the human species are formed by this method. In mammals it is most extensive in the armadillo where the fertilized egg regularly divides into four or eight separate cells which become distinct individuals.
A Synopsis of Biology by W. B. Crow (Auth.)