Question

Blue-eyed Mary is a small wildflower whose petals may have one of three colors: blue, pink, or white. Petal color is determined by the 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; petals are 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 white flowers with other ones that have pink flowers.  All of the many F₁ offspring of this cross have blue flowers. What were the genotypes of the white and pink parents? Please show your work.











B (3). The breeder then crosses two of the blue-flowered F₁ offspring from part A. What are the proportions of blue-, pink-, and white-flowered blue-eyed Mary plants that we should expect to see among the F₂ offspring of this cross? Please show your work.


Answer 1