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BotanyNEET 2024Mendel's laws and deviations

Principles of Inheritance and Variation

A pink-flowered snapdragon plant was crossed with a red-flowered snapdragon plant. What type of phenotype(s) is/are expected in the progeny?

  1. A.Red-flowered as well as pink-flowered plants✓
  2. B.Only pink-flowered plants
  3. C.Red, pink as well as white-flowered plants
  4. D.Only red-flowered plants

Solution

Snapdragon flower colour shows incomplete dominance: pink is the heterozygote (Rr). Pink × red (Rr × RR) gives 1 RR : 1 Rr — red and pink plants only, no white.

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