Deep in a previously unexplored South American rain forest, a species of plants was discovered with true-breeding varieties whose flowers were pink, rose, orange, or purple. A very astute plant geneticist made a single cross, carried to the F2 generation, as shown:
P1: | Purple × Pink |
F1: | all purple |
F2: | 27/64 purple |
| 16/64 pink |
| 12/64 rose |
| 9/64 orange |
Based solely on these data, he was able to propose both a mode of inheritance for flower pigmentation and a biochemical pathway for the synthesis of these pigments.
Carefully study the data. Create a hypothesis of your own to explain the mode of inheritance. Then propose a biochemical pathway consistent with your hypothesis. How could you test the hypothesis by making other crosses?
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