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The 'q' refers to the long arm of the chromosome.

A prototypical condensed chromosome has two arms: a short arm and a long arm. The 'p' stands for the French word 'petit' (which means small). The 'q' doesn't stand for anything in particular, but because 'q' comes after 'p' in the alphabet, it is used to refer to the long arm of the chromosome.

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What does the 24 in chromosome 8q24 mean?

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