What is the difference between a gene and an allele?
A gene is a section of DNA or RNA that codes for a protein. Alleles are different versions of the gene. For example, if a gene coding for a particular enzyme mutated, then there would be two alleles of the gene: the 'normal' form and the mutated form. The proteins encoded would probably also be slightly different, for instance the mutated allele might code for the same enzyme but in a slightly different shape.
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