Light coloured peppered Moth / Biston betularia gets changed to its darker carbonaria variety due to

Options :
  1. translocation of block of genes in response to heavy carbons
  2. deletion of gene segment due to industrial pollution
  3. mutation of single Mendelian gene for survival in smoke laden industrial environment
  4. industrial carbon deposited on wings

Answer and Explanation :-

Answer: Option 3


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