If you just want to display the same content under bio and about you can also create an override for the bio folder and in the template call only {node_view_gui view=full content_node=$aboutnode}.
Maybe also this redirect operator is of interest to you: http://ez.no/community/contribs/template_plugins/redirect_operators
Please note that this sends a http header 301 which might not be suitable for you, so you should change that if necessary.
Claudia
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