Janaki Ammal, C.D. Darlington and J.B.S. Haldane: Scientific encounters at the end of Empire

Right from the beginning, genetics has been an international venture, with international networks involving the collaboration of scientists across continents. Janaki Ammal’s career illustrates this. This paper traces her scienti?c path by situating it in the context of her relationships with J. B. S. Haldane and C. D. Darlington.