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Blue-eyed Mary is a small wildflower whose petals may have one of three colors: blue, pink,...

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Biology

Blue-eyed Mary is a small wildflower whose petals may have oneof three colors: blue, pink, or white. Petal color is determined bythe action of two independently assorting gene loci:


  • Deposit pigment (D/d)

    • D (fully dominant) = deposit pigment in petals
    • d (fully recessive) = do not deposit pigment in petals; petalsare white

  • Blue pigment (B/b)

    • B (fully dominant) = pigment deposited in petals is blue

    • b (fully recessive) = pigment deposited in petals is pink


A (3). A plant breeder crosses blue-eyed Mary plants with whiteflowers with other ones that have pink flowers.  All ofthe many F1 offspring of this cross have blue flowers.What were the genotypes of the white and pink parents? Please showyour work.











B (3). The breeder then crosses two of the blue-floweredF1 offspring from part A. What are the proportions ofblue-, pink-, and white-flowered blue-eyed Mary plants that weshould expect to see among the F2 offspring of thiscross? Please show your work.


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