https://www.quia.com/quiz/806830.html

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http://www.zerobio.com/drag_gr11/mono.htm

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https://www2.palomar.edu/anthro/mendel/quizzes/mendqui2.htm

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http://www.mhhe.com/biosci/genbio/virtual_labs/BL_05/BL_05.html

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http://www.glencoe.com/sites/common_assets/science/virtual_labs/E09/E09.html

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http://sciencereviewgames.com/srg/games/hs.php?id=136