The garden flower Salpiglossis sinuata (painted tongue) comes in many different colors. Several crosses are made between true-breeding parental strains to produce F1 plants, which are in turn self-fertilized to produce F2 progeny. Parents F1 phenotypes F2 phenotypes red × blue all red 102 red, 33 blue
lavender × blue all lavender 149 lavender, 51 blue
lavender × red all bronze 84 bronze, 43 red, 41 lavender
red × yellow all red 133 red, 58 yellow, 43 blue
yellow × blue all lavender 183 lavender, 81 yellow, 59 blue
a. State a hypothesis explaining the inheritance of flower color in painted tongues.
b. Assign genotypes to the parents, F1 progeny, and F2 progeny for all five crosses.
c. In a cross between true-breeding yellow and truebreeding lavender plants, all of the F1 progeny are bronze. If you used these F1 plants to produce an F2 generation, what phenotypes in what ratios would you expect? Are there any genotypes that might produce a phenotype that you cannot predict from earlier experiments, and if so, how might this alter the phenotypic ratios among the F2 progeny?