A-Level Biology and Chemistry revision notes | ExamKata

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AQA Biology · Topic 4

Genetic information, variation and relationships between organisms

7 subtopics · 7 notes written · Year 1

4.1DNA, genes and chromosomesGenes and loci · The triplet code · Features of the genetic codeRead 4.2DNA and protein synthesisThe genome and the proteome · The structure of mRNA and tRNA · Transcription: making mRNA from DNARead 4.3Genetic diversity can arise as a result of mutation or during meiosisGene mutations · Why a substitution often changes nothing · Frameshift: why deletion and addition are worseRead 4.4Genetic diversity and adaptationGenetic diversity · The principles of natural selection · AdaptationsRead 4.5Species and taxonomyWhat is a species? · Courtship behaviour · Classification and taxonomyRead 4.6Biodiversity within a communityBiodiversity and the scale of a habitat · Species richness · The index of diversityRead 4.7Investigating diversityFour ways to compare genetic diversity · Why observable characteristics were replaced · Comparing DNA, mRNA and amino acid sequencesRead