[continued from previous message]   
      
   If the nondisjuction event occurs in meiosis I, meiosis II results in   
   chromatid splitting in a full diploid genome.  I called this a   
   tetraploid egg because that is what the composition of the egg cell   
   would be if you started with a tetraploid and had a normal Meiosis I   
   separation of homologous chromosomes.   
      
   Since recombination occurs before Meiosis I you maintain genetic   
   diversity and do not just produce clones.  When the chromatids split at   
   Meiosis II, recombined genetically unique chromosomes can go into each   
   egg cell.   
      
   I used to make my genetic students understand Meiosis.  I would tell   
   them that if they understood meiosis that they would understand   
   Mendelian genetics.   
      
   Ron Okimoto   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)