variation in the frequency of genes in a population due to random chance events, such as natural disasters or disease

a viral infection that affects the human respiratory system

a natural process seen in viruses in which mutations caused by the process of viral replication cause the virus to appear differently to the immune system

a substance produced by the body that activates the body's defenses against viruses

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B- Unit 6 Lesson 12

Evolution of the Influenza Virus

Term	Definition
genetic drift	variation in the frequency of genes in a population due to random chance events, such as natural disasters or disease
influenza	a viral infection that affects the human respiratory system
mutate	to undergo genetic change
antigenic drift	a natural process seen in viruses in which mutations caused by the process of viral replication cause the virus to appear differently to the immune system
interferon	a substance produced by the body that activates the body's defenses against viruses