Abstract
In the previous paper Sites (1983) described several chromosome polymorphisms within three cytotypes of Sceloporus grammicus. It was concluded that evolution of these chromosomal rearrangements was probably not causally related to speciation. Several of the models discussed yielded specific predictions about population structure that are amenable to empirical testing with an independent data set. This study reports on allozyme variation within and among the same three cytotypes (2n = 32, 2n = 34, and 2n = 36) in the same geographic area as those studied by Sites (1982a) and focuses on three major points of interest: (1) genetic divergence within and among these cytotypes; (2) population subdivision as determined by the distribution of allele frequencies across the population samples; and (3) levels of heterozygosity maintained in each of these cytotypes.
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