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In Mirabilis jalapa , flower colour exhibits incomplete dominance. If a breeder wishes to obtain a progeny containing only pink and white flowers in a 1:1 phenotypic ratio, which of the following crosses should be selected?

Options

  1. ACross between a pink-flowered plant and a white-flowered plant
  2. BCross between a red-flowered plant and a white-flowered plant
  3. CCross between two pink-flowered plants
  4. DCross between a red-flowered plant and a pink-flowered plant

Correct answer

A. Cross between a pink-flowered plant and a white-flowered plant

Step-by-step solution

In Mirabilis jalapa, flower colour shows incomplete dominance. Let the allele for red colour be R and for white colour be r . The genotypes and their corresponding phenotypes are: RR : Red Rr : Pink rr : White To obtain a progeny with only pink ( Rr ) and white ( rr ) flowers in a 1:1 ratio, the cross must be between a heterozygote and a homozygous recessive plant. Crossing a pink-flowered plant ( Rr ) with a white-flowered plant ( rr ): Rr rr 1 Rr (Pink) : 1 rr (White) Thus, a cross between a pink-flowered plant a

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