The distribution of the genetic information to the members of the next generation is accomplished by the various species of living organisms, often in very different ways. The properties of the apparatus of gene distribution (the chromosomes), determining evolution of the population, may differ widely, for instance, in their possibilities of storing manifold genetic variability and bringing it into play in every generation, in their capability of producing particularly valuable genotypes through vegetative reproduction, and in other ways. For this reason all the characteristics of an organism that are related to these possibilities, and other characteristics determining transmission and utilization of genetic information in evolution, are being treated jointly under “genetic systems.”
KeywordsChromosome Number Genetic System Female Flower Breeding System Forest Tree Species
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