"The plant Chloroplastia centruniversiae appears in two forms in the woods individuals has all green or all white leaves. The white leaf form lives for only three days as it cannot photosynthesize. All C. centruniversiae seeds germinate, produce leaves within 1 day, and one day later are flowering; thus white and green leafed individuals can cross and produce F1.
Chlorophyll biosynthesis is dependent upon the expression of the C gene. The X gene encodes a transcription factor required for the activation of the C gene. You cross a true breeding white C. centruniversiae with a true breeding green C. centruniversiae and all of their F1 are green. You then cross any two of these F1 and find that of the 320 F2, 180 are green, and 140 are white.
Please explain these results and indicate the genotypes of all the individuals described in this problem.
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