Allele: one of a number of alternative forms of the same gene.
Allele frequency: the number of times an allele occurs within the gene pool.
The order of bases in each allele is slightly different, so they code for slightly different amino acids, so code for slightly different versions of the same polypeptide.
Any change in the base sequence of a gene produces a new allele of that gene, and results in a different sequence of amino acids being coded for. This can lead to the production of a different protein, which may not function correctly.
In a homologous pair, both chromosomes are the same size and have the same genes, but may have different alleles. Alleles coding for the same characteristics will be found at the same fixed position on each chromosome.
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