You are studying the genes that affect wing size in butterflies. You cross two true-breeding strains (one strain with extremely large wings crossed to one strain with extremely small wings), and then cross the F1 butterflies. You measure 320 F2 butterflies and find that 5 are the same size as the extremely small parent, 5 are the same size as the extremely large parent, and the rest show a range of body sizes between these extremes. How many genes do you estimate contribute to wing size in butterflies?

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Inheritance and Mendelian Genetics

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