duplication vs halving

duplication

noun
  • The act of copying a nucleotide sequence from one chromosome to another. 

  • A nucleotide sequence copied through such a process. 

  • The act of duplicating. 

  • A folding over; a fold. 

  • The act or process of dividing by natural growth or spontaneous action. 

halving

noun
  • The process or instance of dividing in half. 

How often have the words duplication and halving occurred in a corpus of books? (source: Google Ngram Viewer )