Question

A series of spontaneous point mutations that occur gradually resulting in changes in Influenza virus surface antigens over a time is called

• A. genomic instability
• B. antigenic shift
• C. antigenic drift
• D. chromosome translocation

Hint:

Remember: {Antigenic drift} is slow and due to point mutations. {Antigenic shift} is sudden and involves reassortment of genome segments, often between different viral strains.

Answer 1

The Correct Option is C

Step 1: Understand the definition of antigenic drift
Antigenic drift refers to the gradual accumulation of point mutations in the genes encoding surface proteins of viruses, particularly Influenza virus, resulting in small changes to the virus's antigens.
Step 2: Differentiate from antigenic shift
Antigenic shift is a sudden, major change in the Influenza virus due to gene reassortment, often leading to pandemics. In contrast, antigenic drift involves minor changes over time.
Step 3: Contextual application
The question clearly mentions "spontaneous point mutations" and a gradual process—this is characteristic of antigenic drift, not genomic instability or translocations.