If memory searves me correctly, it is a naturally occuring trait. All genes have a dominant and recessive form; however, for the recessive form to show, both alleles on the gene must be the recessive form. ===== J. Miller Edmonton, AB, Can. __________________________________________________ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices! http://auctions.yahoo.com/ ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!