DETERMINAÇÃO E DIFERENCIAÇÃO SEXUAL EM PEIXES TELEÓSTEOS:
PAPEL DOS FATORES AMBIENTAIS E GENÉTICOS
Palavras-chave:
Cromossomos sexuais, diferenciação gonadal, reproduçãoResumo
Peixes teleósteos possuem diversas maneiras de determinação e diferenciação sexual. De modo que, fatores genéticos e ambientais podem atuar interagindo para determinar o sexo e agir sobre a diferenciação das gônadas desses animais. Os fatores ambientais atuam de diferentes formas para determinar o sexo de peixe, uma vez que sua ação é dependente da espécie. Fatores como temperatura, pH, densidade populacional e poluição podem causar a masculinização ou feminização, agindo principalmente sobre os hormônios sexuais e muitas vezes causando a apoptose ovariana e, consequentemente, promovendo a masculinização. Já a determinação genética se dar por cromossomos sexuais (sistema monogênico) ou por ação autossômica (sistema poligênica). No sistema monogênico já foram observados vários modelos de cromossomos sexuais, sendo os principais XX/XY (machos heterogaméticos) e ZW/ZZ (fêmeas heterogaméticas). Com isso, é possível observar que os peixes teleósteos possuem uma grande diversidade de determinação sexual e diferenciação gonadal.
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