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Leslie Clarence Dunn -LRB- November 2 , 1893 in Buffalo , New York -- March 19 , 1974 -RRB- was a developmental geneticist at Columbia University .. developmental geneticist. developmental geneticist. Columbia University. Columbia University. His early work with the mouse T-locus and established ideas of gene interaction , fertility factors , and allelic distribution .. T-locus. T-locus. gene interaction. gene interaction. fertility factors. fertility factor ( bacteria ). allelic distribution. allelic distribution. Later work with other model organisms continued to contribute to developmental genetics .. Dunn was also an activist , helping fellow scientists seek asylum during World War II , and a critic of eugenics movements .. eugenics. eugenics