IB Biology Sub-topic D2.2 Notes
This page contains our IB Biology notes for sub-topic D2.2. By reading each one of these notes, you will fully cover the content for IB Biology 'Gene expression'.
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Gene expression
This topic focuses on the concept of gene expression. Remember that this is the conversion of genes to proteins to express the gene's coded characteristics. In this, three terms are important to differentiate:
- Genome - the collection of an organism's genes.
- Transcriptome - the collection of an organism's transcribed genes.
- Proteome - the collection of an organisms's proteins.
These may all seem equivalent, but this is not the case. Not all genes are transcribed, and not all proteins are produced from their transcribed genes. Thus, the end phenotype exhibited by a person only matches their proteome, not their transcriptome or genome. The changes from genome to proteome result from changes in gene expression. A person's patterns of gene expression is called their epigenome, whilst the study of epigenomes is called epigenetics.
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