Genetic variation for phenotypically invariant traits detected in teosinte: implications for the evolution of novel forms.

Abstract excerpt

How new discrete states of morphological traits evolve is poorly understood. One possibility is that single-gene changes underlie the evolution of new discrete character states and that evolution is dependent on the occurrence of new single-gene mutations. Another possibility is that multiple-gene changes are required to elevate an individual or population above a threshold required to produce the new character...

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