Biology AQA 3.2.2 Genes and Polypeptides

evie.daines Biology Unit 2 A Levels English 1 page

Content of the notes (1)

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

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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