To use Genesis in Poser you will need to use the Dson importer from Daz3d.

http://www.daz3d.com/dson-importer-for-poser

This was offered as a freebie some time back, but is now only free if you purchase $20 worth of Dson extras. DS is Daz Studio

This thread might shed some light on how to use it

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2857786&page=1

There is also a thread over at Daz3d in the commons.

Hope that helps