Allozyme polymorphisms in plant populations
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This discussion will be concerned with two aspects of genetic variability in populations of plants: (1) the extent of genetic variability within the local population, and the patterns in which genetic variability occurs among geographically separated populations, and (2) the mechanisms which are responsible for the observed patterns. These two aspects of genetic variability will be illustrated using a number cif specific examples taken from studies of the eight species listed in Table 1. This list includes two cultivated and six wild species. One of the cultivated species, barley, is nearly completely self-pollinated and the other, maize, is an outcrosser. Among the six wild species there are outbreeders and inbreeders, endemics and introduced colonizing species, diploids and polyploids and so on. Hence these eight species cover a fair range among annual higher plant forms.