XPost: alt.fan.heinlein   
   From: petertrei@gmail.com   
      
   On 2/12/2026 12:51 AM, Lawrence D’Oliveiro wrote:   
   > On Thu, 12 Feb 2026 03:07:57 +0000, danny burstein wrote:   
   >   
   >> Heinlein's character is initially disapproving, but then works out   
   >> the actual math (at least as he figures it) and regards to   
   >> inbreeding of genetic issues, determines it's pretty small, and has   
   >> them go for it.   
   >   
   > The Egyptian Royals had brother marrying sister, because royal blood   
   > was considered too precious to dilute with that from commoners.   
   >   
   > At least, this was true of the Ptolemaic Dynasty (the one with all the   
   > Cleopatras). What would that kind of thing do to the gene pool after a   
   > few generations straight?   
      
   Much earlier, both Akhenaten and Tutankhamen show genetic issues due to   
   inbreeding.   
      
   pt   
      
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