AQA 7402 Section 3.4 + 3.7.1 — DNA structure and replication, genes and the genetic code, transcription, translation, gene mutations, meiosis and genetic variation, Mendelian genetics, dihybrid inheritance, sex-linkage and autosomal linkage, epistasis and polygenic inheritance. Co-hosts 3.4 (DNA + protein synthesis + mutations + meiosis) and 3.7.1 (inheritance) because the teaching flow from DNA → protein → variation → inheritance is more pedagogically coherent than the spec's split. Sources: dna-gene-expression-depth L0-L4 + cells-transport-depth L7 (meiosis) + genetics-evolution-depth L0-L3.
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