Q: What does the crossing of two white flowers resulting in a colored flower demonstrate?  

Answer: A

When two true breeding varieties of white flowered plants are crossed, the resulting progeny may not have white flowers. In some cases, the resulting flowers may be a different color, indicating that there is a complementary gene interaction between the alleles controlling flower color. This means that both alleles contribute to the production of a pigment required for the final color of the flower.

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