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Genetic code - HSN forum

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Genetic code


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#1 sarmad

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Posted 20 October 2006 - 07:20 PM

I dont realy understand codons:

With reference to the relationship between the genetic code and the protien synthesised, why is it not possible that

i) one base corresponds to one amino acid?
ii) two base correspond to 1 amino acid?


#2 werlop

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Posted 09 December 2006 - 01:06 AM

OK so there are 4 bases in DNA and 20 amino acids.

1 base cannot code for one amino acid because you would only get 4 amino acids.

2 bases cannot code for one amino acid because you would only get 16 amino acids.

3 bases can code for 64 amino acids. 64 is obviously more than 20 so we get what is called redundency in the genome which means that more than one codon can be used for one particular amino acid.
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