Chick's Response to an Imprinting Stimulus: Heterosis and Evolution

Science  19 Apr 1968:
Vol. 160, Issue 3825, pp. 329-330
DOI: 10.1126/science.160.3825.329


Tendencies of day-old chicks to respond toward, to approach, and to stay near a distant audiovisulal imprinting apparatus were shown to be inherited in a heterotic manner. High correlations found among the traits suggest that these behavioral responses are not independent but sequential. The fitness value of such a behavioral sequence is explained in terms of imprinting.