Exercício 3 Biologia Geral Profa Fernanda

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3. 4.

Não existem pessoas geneticamente idêntica, à exceção dos gêmeos idênticos. A principal causa da variação genética entre seres humanos é: a) novas mutações que ocorreram nas gerações anteriores. b) Deriva genética. c) Recombinação de alelos na reprodução sexuada. d) Efeitos ambientais. Existem 25 indivíduos na população 1, todos com o genótipo AA, e existem 40 indivíduos na população 2, todos com o genótipo aa. Considere que essas populações estão localizadas longe uma da outra e que suas condições ambientais são muito semelhantes. Com base nas informações fornecidas, a variação genética observada é mais um exemplo de: a) deriva genética. b) Fluxo gênico. c) Acasalamento não randômico. d) Seleção direcional. Utilizando apenas dois exemplos, explique como o processo de reprodução é revelado pelas imperfeições dos organismos vivos. Este lago tipo caldeirão formou-se há 14.000 anos quando uma geleira que cobria a área derreteu. Inicialmente desprovido de vida animal, com o tempo o lago foi colonizado por invertebrados e outros animais. Formule uma hipótese de como mutações, seleção natural, deriva gênica e fluxo gênico podem ter afetado as populações que colonizaram o lago.

Respostas: 1.c 2.b



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