Genes•Units of inheritance.•The number of genes in humans is now estimated at about 30,000-lower than the initial estimate of >100,000, and similar to the number estimated for “simpler” animals, e.g., roundworm (20,000).•Can be switched on and off during development to cause cell specific properties to emerge--- long term expression.•Can be switched on and off in response to specific stimuli, e.g., painful stimuli can switch on the protooncogenec-fos-function is unknown.
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Central Dogma of Molecular Biology: DNA Makes Complementary mRNA. mRNA Codes for Strings of Amino Acids Called ProteinsEach amino acid within a protein is coded by 3 base pairs of DNA/RNADNA mRNA ProteinTranscription Translation