2. The petals of the plant Collinsia parviflora are normally blue, giving the sp

Question

2. 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 blue X white blue X pinlk pink X white F1 blue blue blue F2 101 blue, 33 white 192 blue, 63 pink 272 blue, 121 white,89 pink Explain these results genetically. Define the allele symbols that you use, and show the genetic constitution of parents, F1, and F2. a. 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 were white. What must the genotypes of these two F3 plants have been?

Explanation / Answer

Answer:

As per the given data:

Based on the F1 generation data, it is clear that Blue is dominant to both Pink and White Color

Parents                                               F1                                            F2

Blue X White                                       Blue                                      101 blue, 33 white - Monohybrid Cross (1 gene)

Blue X Pink                                         Blue                                      192 blue, 63 pink - Monohybrid Cross (1 gene)

Pink X White                                       Blue                                      272 blue, 121 white, 89 pink (> 1 gene)

Phenotypic Ratio obtained in F2 generation in above data:

Expected genotype of Parents:

b)

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