Variations in proteins can arise from a SINGLE gene using

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Alternative splicing is a process by which a single gene can produce multiple protein isoforms through the inclusion or exclusion of different exons during mRNA splicing. This results in variations in the final protein products without any changes to the underlying DNA sequence. Different alleles, duplication of genetic material during crossover, and mobile elements can also cause variations in proteins, but they involve changes in the DNA sequence itself, rather than post-transcriptional modification like alternative splicing.

Variations in Proteins Can Arise from a SINGLE Gene Using