Parents F1 F2 blue x white blue 101 blue, 33 white 192 blue, 63 pink 272 blue, 121 white, 89 pink blue x pink blue pink x white blue a. Explain these results genetically. Define the allele symbols that you use, and show the genetic constitution of the parents, the F, and the F2 in each cross. b. A cross between a certain blue F2 plant and a certain white F2 plant gave progeny of which were blue, were pink, and were white. What must the genotypes of these two F2 plants have been?
The petals of the plant Collinsia parviflora are normally
blue, giving the species its common name, blue-eyed
Mary. 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 × white blue 101 blue, 33 white
blue × pink blue 192 blue, 63 pink
pink × white blue 272 blue, 121 white, 89 pink
a. Explain these results genetically. Define the allele
symbols that you use, and show the genetic constitution
of the parents, the F1, and the F2 in each cross.
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?
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