The garden flower Salpiglossis sinuata (paintedtongue) comes in many different colors. Severalcrosses are made between true-breeding parentalstrains to produce F1 plants, which are in turn selffertilized to produce F2 progeny.Parents F1 phenotypes F2 phenotypesred × blue all red 102 red, 33 bluelavender × blue all lavender 149 lavender, 51 bluelavender × red all bronze 84 bronze, 43 red, 41 lavenderred × yellow all red 133 red, 58 yellow, 43 blueyellow × blue all lavender 183 lavender, 81 yellow, 59 bluea. State a hypothesis explaining the inheritance offlower color in painted tongues.b. Assign genotypes to the parents, F1 progeny, andF2 progeny for all five crosses.c. In a cross between true-breeding yellow and truebreeding lavender plants, all of the F1 progeny arebronze. If you used these F1 plants to produce anF2 generation, what phenotypes in what ratioswould you expect? Are there any genotypes thatmight produce a phenotype that you cannot predictfrom earlier experiments, and if so, how might thisalter the phenotypic ratios among the F2 progeny?
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 selffertilized to produce F2 progeny.
Parents F1
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?
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