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Genetic information, variation and relationships between organisms
(AQA AS Biology) PART 1 of 6 TOPICS



DNA, genes and chromosome:
Prokaryotic cells have short, circular DNA molecules that are not associated with proteins known as
histone.

Eukaryotic cells have long, linear DNA molecules which are associated with histone proteins.
Chromosomes are…

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It is non-overlapping: Only one base is used for a triplet
It is degenerate: Many triplets can code for an amino acids

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