What does ‘GM’ stand for in GM seed?

Genetic engineering — a branch of biotechnology — directly alters an organism's genetic material, inserting, removing, or editing specific genes, using modern techniques such as recombinant-DNA technology or targeted gene editing, in order to introduce, remove, or enhance a trait. This differs from conventional selective breeding, which works by selecting among genetic variation that already exists within a species, without directly manipulating genes.

In the phrase 'GM seed', GM is the standard abbreviation for 'Genetically Modified' — a seed whose genome has been directly altered using modern genetic-engineering techniques such as recombinant-DNA technology or targeted gene editing, for example inserting a bacterial gene into cotton (Bt cotton) for pest resistance. The USDA (a United States government department) and the FAO (a United Nations agency) both use this same expansion.

Checking the other listed phrasings

• 'Generally modified' — 'generally' means 'in most cases' or 'usually', describing frequency or scope; it is not a defined genetic-engineering procedure.

• 'Genetically medicated' — 'medicated' means treated with a medicine or drug for a therapeutic effect; it describes administering a substance, not altering genetic material.

• 'None of these' — this would only hold if none of the other three phrasings matched the standard expansion used in agricultural biotechnology, which is not the case here.

Cross-checking against primary sources (USDA data products, FAO's glossary of biotechnology terms) confirms the same expansion, so the acronym GM in 'GM seed' expands to Genetically Modified.