Hi All, Thanks to those who responded quickly. Just to clarify on this (original post below), the data in the tables is total allele frequencies for each population. There is no information on which individuals had which alleles or which alleles for a given locus occurred with which alleles for another locus, so the types of infiiles used for e.g. Fstat, Genepop and Genetix would not be possible to make. Data example: Locus Allele Pop1 Pop2 pgm A 0.5 0.3 B 0.5 0.7 Pgi A 0.3 0.5 B 0.7 0.5 Arlequin has a "frequency" data option, that takes frequency data by population for a single locus, but to enter mutliple loci, you need to know the multilocus haplotypes, i.e. which alleles go together from differrent loci, e.g. the frequency of PgmA with PgiA is one line, PgmB/PgiA the next, etc for all combinations. Not something that can derived from these tables. Thanks again for your thoughts and suggestions, Amy -- Amy Baco-Taylor, PhD Department of Oceanography 117 N. Woodward Avenue P.O. Box 3064320 Tallahassee, FL 32306-4320 Phone: (850) 645-1547 Fax: (850) 644-2581 abaco@ocean.fsu.edu Amy Baco-Taylor