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Transcript
Chapter 29 Genetic Control Role of Genes Essential proteins (for enzymes and structure) are synthesised according to the base sequence encoded in the cell’s DNA. A particular segment of DNA called a gene codes for each protein. Thus the structure and function of cell is determined and controlled by its genes. All undifferentiated cells have the genetic machinery to specialise into any of the body cells. Differentiation: Complete Reversibility of Differentiation Amphibians Dolly the sheep 1 Chapter 29 Two Categories of Genes: 1) Switched on all the time This group of genes in all cells code for Vital Metabolites necessary for the biochemical processes basic to life. e.g. switched on genes to code for enzymes for respiration. 2) Switched on only in a particular cell This group are only switched on in particular cells where they code for proteins characteristic of that cell type and no other. Genetic Control of Cell differentiation 1) Blood Cells - see diagram Complete note 2) Parenchyma - see diagram Complete note 2 Chapter 29 Explain why parenchyma cells are used for Tissue Culture. Genetic Control of leaf shape 3
