Konstantin Mereschkowski – Russian botanist who in 1905 described the Theory of Endosymbiosis. Edmund Beecher Wilson – Known as America's first cellular biologist, discovered the sex chromosome arrangement in humans. Albert Claude – Shared the Nobel Prize in 1974 "for describing the structure and function of organelles in biological cells" Theodor Boveri – In 1888 identified the centrosome and described it as the 'special organ of cell division.'