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Abstract. The ‘Green Revolution’ designates the application of Mendelian principles to seed selection and crossing beginning in the 1940s to establish new plant varieties affording higher‐yielding crops. Its technology and products failed to win acceptance in some less developed countries. The case of Nealtican, Mexico, helps to explain why. Its rejection is seen, given the specific circumstances of the cultural and physical environment, as a rational response. The policy problem is to overcome site‐specific constraints—when scientific investigation has determined what they really are.

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