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Another Question....

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Another Question....

Postby MelC2005 » Thu Dec 08, 2005 5:08 pm

If a DNA strand contains a point mutation somewhere in the sequence, what are some ways that this would NOT be expressed in the protein product?
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Postby GreenDog » Thu Dec 08, 2005 11:56 pm

Does all DNA code for proteins?
How many possible codons are there, and how man amino acids are there?
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Postby Jessieh04 » Thu Dec 29, 2005 4:13 am

I think what green dog is trying to hint at, is that there are of 64 triplets of nucleotides (codons) in the human genome. with 3 exceptions, each codon encodes for one of only 20 amino acids which synthesize of proteins. that means there is redundancy. most of the amino acids are being encoded by more than one codon.

So one possibility is a silent mutation. For example, if the third base in the TCT codon for serine is changed to any one of the other three bases, serine will still be encoded. This is a silent mutations and it doesnt change its product.
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