GM salmon grow faster because they contain

  1. a Bt gene
  2. a gene for vitamin A
  3. a growth hormone gene with a promoter active all year
  4. a herbicide-resistance gene
Answer

C) a growth hormone gene with a promoter active all year

Growth hormone is produced continuously. AS & A Level Biology · Topic 19 Genetic Technology · 19.3 Genetically modified organisms in agriculture

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