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<br />These differences were summarized as nine indices of genet)c <br /> <br />relatedness (Appendix 2): ~oge~s (1972) genetic similarity and <br /> <br />distance; the modified Rogers dist~nce (Wright,1978); the Nei <br /> <br />(1978) unbiased genetic identity and distance measures; the Nei <br /> <br />(1978) unbiased minimum distance measure; the Nei (1972) minimu~ <br /> <br /> <br />distance index; and the Hillis (1984) modifications of the Nei <br /> <br /> <br />distance (1972) and identity (1978) indices. The degree of <br /> <br />relatedness was essentially the same in all cases. <br /> <br />Preference is <br /> <br />given to the Rogers (1972) indices, due to its adherence to the <br /> <br />triangular inequality theorem in calculation of genetic distances <br /> <br />(see 3uth, 1984, for a comparison of the above indices); diagr3m- <br /> <br />matic presentation of a cluster analysis using the Rogers <br /> <br />identity index is shown as Figure 1 (See Appendix 2 for cluster <br /> <br />analyses using the other above-mentioned indices). <br /> <br />Relative to <br /> <br />the Gunnison River "roundtail" chub, the other population s=il1ples <br /> <br />showed a phenetic relationship <similarity' as follows: (a) <br /> <br />"bony tail" ct1ub, 0.61J; (b) "humpback" chub, 0.64; (c) tui chub, <br /> <br /> <br />0.68; (d) Utah chub, 0.85; (e) Dexter hybrid, 0.89. <br /> <br />DISCUSSION <br /> <br />Different tissues within the same organism may possess different <br /> <br />electromorphs for a particular protein. <br /> <br />Fin assays on the <br /> <br />Colorado River chubs resulted in the detection of no variation, <br /> <br />in contrast to the eXamination of liver proteins. <br /> <br />Since no <br /> <br />differences were detected, fin clips with respect to the assayed <br /> <br />5 <br />