The host range of animal viruses can be altered if two viruses with different host ranges infect the same cell. Genes of one virus can be incorporated into the protein coat of the other virus in the process of viral assembly.
■ Differentiate between antigenic shift and antigenic drift in the influenza virus.
■ Can phenotypic mixing alter other properties of a virus other than host range? Explain.
■ Why does the exchange of protein coats alter the host range of a virus?
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