NEET BIOLOGY

Detailed explanation-1: -As a virus replicates, its genes undergo random “copying errors” (i.e. genetic mutations). Over time, these genetic copying errors can, among other changes to the virus, lead to alterations in the virus’ surface proteins or antigens. Our immune system uses these antigens to recognize and fight the virus.

Detailed explanation-2: -Sometimes viruses can have mutations that give the virus an advantage, whether that’s a better attachment to cells or the ability to replicate faster. Mutations can also result in disadvantages for the virus, lowering the ability to attach to cells or taking longer to reproduce, ” Dr. Best says.

Detailed explanation-3: -Why does the virus mutate? Viruses, like all living things, go through mutations throughout their lifespan. If a mutation provides a survival advantage, then that mutated version becomes the dominant strain.