1) German biological term 
An ahnentafel (German for `ancestor table`; lang) or ahnenreihe (`ancestor series`; lang) is a genealogical numbering system for listing a person`s direct ancestors in a fixed sequence of ascent. The subject (proband or progenitor) of the ahnentafel is listed as No. 1, the subject`s father as No. 2 and the mother as No. 3, the paternal grand...