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Fw: Secondary Flightlessness

-----Original Message-----
From: larryf <larryf@capital.net>
To: dinosaur@usc.edu <dinosaur@usc.edu>
Date: Wednesday, August 05, 1998 11:08 AM
Subject: Re: Secondary Flightlessness

>I`m no expert in many fields. Embryology is one of them. Thinking on what
>would induce a flightless condition in birds, I`m lead into thinking that
>some sort of genetic "defect" might be responsible. Can any ornithologist
>out there suggest any possibilities? Has there been documentation of some
>condition (i.e. poorly developed flight feathers, or wing bones,  etc.)
>would cause a group of such creatures to become confined to ground level? A
>condition that might have been passed on to descendants? Is this in fact a
>common occurrance in nature? My thinking here is that such a specialized
>condition of flight would need the utmost upkeep of a near perfect genome,
>with the odds for imperfections creeping up being quite high. Am I correct
>in assuming this??