In a species of lily, purple flowers are dominant to yellow flowers. Brown spots on the...
In a species of lily, purple flowers are dominant to yellow flowers. Brown spots on the petals are dominant to orange spots. A plant breeder has a true breeding purple lily with brown spots. She also has a true breeding yellow lily with orange spots. Using your knowledge of genetics and dihybrid crosses, describe a method she could use to develop a variety of lily, beginning with these flowers, that has yellow petals with brown spots. The described method should give her plants which will always produce this type of flower.
Homework Answers
In a dihybrid cross, we can multiply two genes of organisms with different traits. And we can analyze the offspring factors in each progeny. In this experiment, we took two traits of petal color and spot colors. Now in this experiment, it is already showed that pink colored petals are dominant and yellow color petals are recessive, simultaneously brown spots are dominant traits and orange spots are recessive.
So, Here PP = Purple flower and pp = Yellow flower
BB = Brown spot and bb = Orange spot
So after the dihybrid cross, we found some result like:
Purple flower and Brown spot (PPBB, PpBB, PPBb, PpBb) = 9 offsprings
Purple flower and orange spot (PPbb, Ppbb) = 3 offsprings
Yellow flower and Brown spot (ppBB, ppBb) = 3 offsprings
Yellow flower and orange spot (ppbb) = 1 offspring
So, in the picture, we can see the phenotypic ratio, which is 9:3:3:1
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