Final answer:
When a univalent antigen interacts with a multivalent antigen in an antigen-antibody interaction, the typical outcome is weaker binding and reduced immune response.
Step-by-step explanation:
In an antigen-antibody interaction, when a univalent (monovalent) antigen interacts with a multivalent antigen, the typical outcome is weaker binding and reduced immune response. This is because multivalent antigens have multiple binding sites, allowing them to bind with multiple antibodies simultaneously. As a result, the binding between a univalent antigen and a multivalent antigen is weaker compared to the binding between two multivalent antigens, leading to a reduced immune response.