. Advanced biology. Biology; Physiology; Reproduction. 266 SEXUAL REPRODUCTION through the bridge, all the cells in that fila- ment are active cells. If one individual in a filament is a passive cell, all other cells of that filament are pas- sive or receiving cells. There is more physio- logical differentiation in the Spirogyra than in the mold, in that the gametes behave differentlv. The ac- tive gametes may be compared to male gam- etes of higher plants and animals, the passive, or receiving gam- etes, to female gametes. After the zygospores are formed, the filament sheath breaks down, the
. Advanced biology. Biology; Physiology; Reproduction. 266 SEXUAL REPRODUCTION through the bridge, all the cells in that fila- ment are active cells. If one individual in a filament is a passive cell, all other cells of that filament are pas- sive or receiving cells. There is more physio- logical differentiation in the Spirogyra than in the mold, in that the gametes behave differentlv. The ac- tive gametes may be compared to male gam- etes of higher plants and animals, the passive, or receiving gam- etes, to female gametes. After the zygospores are formed, the filament sheath breaks down, the cell walls disintegrate, and the zygospores fall to the bottom of the pond. They stay in a dor- mant condition until there is sufficient water and warmth to pro-. There seem to be two different strains of bread mold called plus and minus. The hypha of unlike strains attract each other and zygospores are Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wheat, Frank Merrill; Fitzpatrick, Elizabeth T. New York ; Boston [etc. ] : American Book Company
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