- DNA, the base sequence (ACT) constitutes the Gene and the form of the Gene is called the Allele
- Certain processes can result in the change of the base sequence (into AAT).
- This change creates a new version of the allele
- It is possible that it will result into the production of an entirely different protein and have an entirely different effect on the phenotype.
- Different alleles (dominant and recessive) exist because of the process mutation = changes the base sequence of the gene.
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