What is meant by genetic code ?

1.	What is meant by genetic code ?
Answer» Though made-up of only four types of nucleotides, nucleotides of DNA can be positioned in a countless way. As a result, single DNA molecule has several thousand nucleotides, a limitless specificity can be incorporated in the DNA. There is intimate connection between genes and the synthesis of polypeptides. Genes are made- up of nucleotides, arranged in a specific manner. Arrangement of nucleotides or their nitrogen bases is connected with synthesis of proteins by influencing the corporation of amino acids in them. The relationship between the sequence of amino acids in a polypeptide chain and nucleotide sequence of DNA or mRNA is called genetic code. DNA contains only four types of nucleotide or nitrogen bases while the amino acid is 20. It was, therefore, hypothesized, the triplet code (consisting of three adjacent bases for one amino acid) is operative.

Answer»

Though made-up of only four types of nucleotides, nucleotides of DNA can be positioned in a countless way. As a result, single DNA molecule has several thousand nucleotides, a limitless specificity can be incorporated in the DNA.

There is intimate connection between genes and the synthesis of polypeptides. Genes are made- up of nucleotides, arranged in a specific manner. Arrangement of nucleotides or their nitrogen bases is connected with synthesis of proteins by influencing the corporation of amino acids in them. The relationship between the sequence of amino acids in a polypeptide chain and nucleotide sequence of DNA or mRNA is called genetic code. DNA contains only four types of nucleotide or nitrogen bases while the amino acid is 20. It was, therefore, hypothesized, the triplet code (consisting of three adjacent bases for one amino acid) is operative.

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