What is alternative splicing and how does it impact gene expression in biology?

Alternative splicing is a process in which different combinations of exons are joined together during the processing of pre-mRNA, leading to the production of multiple mRNA transcripts from a single gene. This allows for the generation of different protein isoforms from the same gene, increasing the diversity of proteins that can be produced. Alternative splicing plays a crucial role in regulating gene expression and can impact various biological processes, including development, cell differentiation, and disease.