From: exxjxw.hannivoort@inter.nl.net   
      
   Graeme Wall  wrote on 22 Jan 2020 in   
   soc.genealogy.britain:   
      
   > On 22/01/2020 10:34, Evertjan. wrote:   
   >> Ian Goddard  wrote on 21 Jan 2020 in   
   >> soc.genealogy.britain:   
   >>   
   >>> I have a family tree whereby a group of siblings have four lines of   
   >>> descent from the same couple.  For three of these there are 7   
   >>> generations and for the other there are 6 generations.  The 7 generation   
   >>> descent would give 128 distinct genealogical roles at this level and the   
   >>> 6 generation descent would give 64.  In fact I find 10 individuals   
   >>> filling 24 of these roles so there are 14 "missing" ancestors due to   
   >>> pedigree collapse.   
   >>   
   >> They are not really missing,   
   >> as it is the norm  called earth.   
   >>   
   >> When the niche gets smaller, called isolation,   
   >> the phenomenon gets more pronounced,   
   >> like among sects, monoglots or on remote islands.   
   >>   
   >   
   > Doesn't need to be remote islands,   
      
   What's unclear in my "like"?   
      
   > I have pronounced examples in my   
   > wife's family in both North and South America. Both as a result of the   
   > families being there in early colonial days.   
      
   What's unclear in my "more pronounced in [] ecological niches"?   
      
      
   --   
   Evertjan.   
   The Netherlands.   
   (Please change the x'es to dots in my emailaddress)   
      
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