Brandão, Gilberto Oliveira (Author)
Ferreira, Louise Brandes M. (Author)
0 =Igo publicado em outubro de 1905 par Edmund Beecher Wilson (1856-1939) aqui traduzido faz pane de urn conjunto de pes-quisas citolOgicas realizadas no inicio do seculo XX. Insere-se em uma tradicio de pesquisa sobre o nadao e a organizacio dos cromos-somos durante a gametogenese, em particular neste trabalho, sabre a espermatogenese de especies de Hemiputir (Morgan, 1940). Wilson dedicou-se Embriologia experimental, sendo que urn de seus principals objetos de estudo era o que foi chamado de "organi-zacio do Ovulo", bem como a clingem em celulas-ovo ern diverns especies. Uma das suas contribuicoes mais importantes pan a Biolo-gia ern Citologia foi a serie de oito estudos sabre cromossomos pu-blicados entre 1905 e 1912. o sistema de determinacio do sexo mais conhecido é aquele no qual as gametas de machos ou femeas sio diferentes e, a pardr da combinacio de determinados cromossomos ocorrem condic6es pan o surgimento de estruturas reprodutivas dos dois sexos durante o desenvolvimento embrioner. io. Entretanto, outros mecanismos de definisio sexual existem pan os organismos: em alguns organismos a
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