Abstract
Artificial selection for choice between high protein content and high energy content of food was performed for 44 generations of fruitfly larvae. There were significant responses to selection both in a line selected to choose high energy food and in a line selected to choose high protein food. Both lines showed a significantly higher preference for the selected food type than did the control line. The line selected for high energy food also showed a significant increase in response over the generations. Since the selection resulted in lines that differed significantly from controls and from each other, there must be some genetic basis for food choice behaviour. Realized heritability was very low in both selected lines. Viability, as measured by larval weight, pupation time, emergence time and adult size, was significantly higher for flies raised on high protein food than for those raised on high energy food.
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