Final answer:
Exon shuffling, intron retention, and alternative splicing are ways to maintain accuracy of splice-site selection in biology.
Step-by-step explanation:
The ways to maintain accuracy of splice-site selection include exon shuffling, intron retention, and alternative splicing. Exon shuffling is a process where exons are rearranged to create different combinations, allowing for different protein products to be produced from one gene. Intron retention occurs when introns are not removed during transcription, which can block the expression of one polypeptide sequence or alter the polypeptide expressed. Alternative splicing is a mechanism that allows different combinations of introns and exons to be removed from the primary transcript, resulting in different protein products.