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NEETZoologyPrinciples of Inheritance and Variation

What does the incomplete dominance in snapdragons allow us to distinguish?

Options

  1. ARed from white flowers
  2. BRr as pink from RR (red) and rr (white)
  3. CDominant from recessive alleles
  4. DDifferent species of snapdragons

Correct answer

B. Rr as pink from RR (red) and rr (white)

Step-by-step solution

When experiments on peas were repeated using other traits in other plants, it was found that sometimes the F1 had a phenotype that did not resemble either of the two parents and was in between the two. The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum sp.) is a good example to understand incomplete dominance. In a cross between true-breeding red-flowered (RR) and truebreeding white-flowered plants (rr), the F1 (Rr) was pink (Figure 4.6). When the F1 was self-pollinated the F2 resulted in

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