CIE A Level Biology

Revision Notes

Syllabus Edition

First teaching 2020

Last exams 2024

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19.1.1 Recombinant DNA

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Recombinant DNA

  • The genetic code is universal, meaning that almost every organism uses the same four nitrogenous bases – A, T, C & G. There are a few exceptions
  • This means that the same codons code for the same amino acids in all living things (meaning that genetic information is transferable between species)
  • Thus scientists have been able to artificially change an organism's DNA by combining lengths of nucleotides from different sources (typically the nucleotides are from different species)
  • The altered DNA, with the introduced nucleotides, is called recombinant DNA (rDNA)
  • If an organism contains nucleotide sequences from a different species it is called a transgenic organism
  • Any organism that has introduced genetic material is a genetically modified organism (GMO)

Recombinant DNA, downloadable AS & A Level Biology revision notes

Illustration of a maize plant that has recombinant DNA (DNA from Bacillus thuringiensis)

Exam Tip

It is because of the universal genetic code that recombinant DNA can be formed. All forms of life use the same genetic code, which is the strongest piece of evidence for evolution. Remember, the genetic code is the basis for storing instructions that, alongside environmental influences, dictate the behaviour of cells and as a result, the behaviour of the whole organism.

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Lára

Author: Lára

Lára graduated from Oxford University in Biological Sciences and has now been a science tutor working in the UK for several years. Lára has a particular interest in the area of infectious disease and epidemiology, and enjoys creating original educational materials that develop confidence and facilitate learning.