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GCSE Biology · key term
The study and comparison of DNA or RNA sequences to investigate relationships between organisms.
Used by Edexcel
Specification 4.7 · Paper 1
Revise: ClassificationGenetic analysis allows scientists to compare the sequences of bases in DNA or RNA from different organisms. These sequences are inherited, but mutations cause them to change gradually over generations.
When asked how genetic analysis changed classification, give the full chain: compare genetic sequences → identify similarities and differences → infer evolutionary relationships → separate Archaea from Bacteria → propose three domains.
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