[…] the genetic program which produces language in the species highly specifies some areas of language and leaves others undetermined; this is only to be expected, as a genetic blueprint which leaves no room for variation and development would freeze a species at a single developmental level.
- Bickerton (1981), a pag.56

[…] genetic programs in general […] do not prescribe sets of alternative routines, but leave open the possibility of adapting given routines for other purposes.
- Bickerton (1981), a pag.190