Data are reported on the distribution of SOD-A electrophoretic phenotypes in the Italian population, and on the concentration of SODA-A-2-1 phenotype in a family group of a small village. The frequency of the rate allele SOD-A(2) is estimated and compared with the frequency in other populations. By applying a model of population dynamics for rare neutral genes estimates are derived of the mean first arrival time and mean age, in generations, of SOD-A(2) allele.
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