This looks like homework to me so I'll make suggestions rather than code
1) Filehandles can be stored in variables too:
my ($fh1, $fh2);
open $fh1, ">GENEID.out" or ...
open $fh2, ">PROTID.out" or ...
2) Read every line - print every line. You are obviously not doing that.
3) set another Filehandle var '$fh' with the appropriate Filehandle as you detect a change and use your new $fh to store and print to the right file.
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