Chapter:

Molecular-Basis-of-Inheritance

According to finding from Human Genome Project, re are about 25000 genes but re are amny more different polypeptides. Which of following processes might explain discrepancy between number of genes and polypeptides?
(1) Mutations
(2) Post-translational modifications
(3) Crossing over during meiosis
(4) Alternating splicing of RNA transcripts