Warwick Estevam Kerr ( born September 9 , 1922 , Santana do ParnaÃ ba , SÃ # o Paulo , Brazil ) was a Brazilian engineer , geneticist , entomologist , and professor . He made many discoveries in the genetics and sex determination of bees . Warwick Estevam Kerr ( b. September 9 , 1922 , Santana do ParnaÃ ba , SÃ # o Paulo , Brazil ) is a Brazilian agricultural engineer , geneticist , entomologist , professor and scientific leader , notable for his discoveries in the genetics and sex determination of bees .