Global symbol "$refToArrA" requires explicit package name at /tmp/junk.pl line 53.
Global symbol "$refToArrB" requires explicit package name at /tmp/junk.pl line 54.
Global symbol "$refToArrC" requires explicit package name at /tmp/junk.pl line 55.

##</code><code>##

for ( 1 .. $popCt ) {
    my ( $refToArrA, $refToArrB, $refToArrC ) = makeArrays();
    &gener( $refToArrA, $refToArrB, $refToArrC );
}

# ...

sub gener
{
    my ( $refToArrA, $refToArrB, $refToArrC ) = @_;
    ...
}