1 nocoes basicas de hereditariedade
TRANSCRIPT
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Palavras chave:Transmissão da vida. Material genético. Fecundação. Localização da informação genética / cromossomas e DNA. Cariótipo humano, masculino e feminino. Cromossomas sexuais. Transmissão da informação genética. Herança do sexo.
Noções Básicas de Hereditariedade
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Em alguns períodos da vida celular,
cada cromossoma é constituído por
um cromatídio e, noutros períodos, o
DNA duplica e o cromossoma fica
constituído por dois cromatídios. Os
cromatídios de um cromossoma
ligam-se entre si através do
centrómero. Cada cromatídio é
constituído, basicamente, por DNA e
proteínas. O DNA transporta a
informação genética e as proteínas
são responsáveis pela forma física do
cromossoma.
Durante divisão celular, a
espiralização do DNA torna esta
molécula condensada. No inverso, a
sua desespiralização torna-a uma
molécula distendida.
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