Biology AQA 3.2.2 Genes and Polypeptides

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A gene occupies a fixed position on a strand of DNA, this is called a locus.

Genes: sections of DNA that contain coded information due to specific bases.

Genes code for polypeptides and determine the nature and development of an organism

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The base sequence of genes can change due a mutation- this causes an allel

A sequence of 3 gene bases (triplet code) codes for a specific amino acid

Amino acids make up polypeptides

Eukaryotes:

A lot of DNA doesnt code for anything.

these are called introns.

Differences in genes and alleles might result in non-functional proteins/ enzymes.

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