D.   Hugo DeVries’ ANSWERS
         Modification of Darwin’s Theory (about 1920)
        (Bio H and some Bio R students should refer back Darwin Part 2
        (# 7 Weaknesses) at this time.

             Hugo DeVries was a dutch biologist.  He updated the theories of
        Charles Darwin (mid 19th century) to also include more recent biological
        developments as of the 1920's.  

      1.  The cause of the new variation that preceded competition is the sudden
          appearance of  M U T A T I O N S  within the population.

      2.  Inherited trait mutation must occur in the reproductive tissue
           (S E X   C E L L S)  within the  G O N A D S) of the individual.   

          Male gonad tissue are the T E S T E S  & female gonad tissue are
          the  O V A R I E S.

 

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