The petals of a plant Collinsia are normally blue. Two pure breeding lines were obtained from color variants found in nature, the first line had pink petals and the second line had white petals. The following crosses were made between pure lines, with the results shown…
Parents F1 F2
blue x white blue 101 blue, 33 white
blue x pink blue 192 blue, 63 pink
pink x white blue 272 blue, 121 white, 89 pink

a. Explain these results genetically. Define the alllele symbols that you use and show the genetic constitution of parents, F1, and F2.

b. A cross between a certain blue F2 plant and a certain white F2 plant gave progeny of which 3/8 were blue, 1/8 were pink, and 1/2 were white. What must the genotypes of these two F2 plants have been?