7. Using Neurospora as the experimental system to study biosynthetic pathways of niacin, George Beadle and (E) L. Tatum concluded from their studies that genes control the production of enzymes required for niacin biosynthesis. They then proposed the ‘one-gene-one-enzyme hypothesis’. What might be wrong with this hypothesis? (5 分)

6. To study the inheritance of the white-eye trait in Drosophila melanogaster, Morgan crossed the white-eyed male to a red-eyed female and found that all of the F1 offspring had red eyes. The F1 offspring were then mated to each other, which generated 2,459 red-eyed females, 1,011 red-eyed males, and 782 white-eyed males. (1) How will you interpret these experimental data? (4 分)

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