Question: who proposed the coupling and repulsion theory of linkage
[{'answer': 'Alfred Sturtevant', 'provenance': [{'wikipedia_id': '274192', 'title': 'Genetic linkage', 'start_paragraph_id': 10, 'start_character': 319, 'end_paragraph_id': 10, 'end_character': 336, 'bleu_score': 1.0, 'section': 'Section::::Linkage map.\n'}]}, {'provenance': [{'wikipedia_id': '274192', 'title': 'Genetic linkage', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 369, 'bleu_score': 0.96746874041754, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12483100614460383108}, 'section': 'Section::::Linkage map.\n'}]}]