Within the context of the study of the genetics of language, Chomskian laws of grammar, such as theStructure-dependence Condition and theA over A Condition, may be usefully regarded to have a status similar to that of Mendelian Laws in classical genetics. In both the case of Chomsky's Laws and Mendel's Laws, formal genetic principles are postulated which abstract away from the physical mechanisms involved and in both cases certain apparent counterexamples mirror a more complex underlying genetic organisation.

Offers an overview of work on the biology of language - what is sometimes called the "biolinguistic approach." This book focuses on the interplay between variation and the universal properties of language. It provides case studies from the areas of syntactic variation, genetic variation, neurological variation and historical variation.