AIIMS 2018 Botany Incomplete Dominance MCQ Question
In Mirabilis jalapa, red flowered plant is crossed with white flowered plant. What will the phenotypic ratio in generation.
1:1:1
1:2:1
3:1
1:1
Correct Answer
Detailed Explanation
In the case of Mirabilis jalapa, the inheritance of flower color exhibits incomplete dominance, where the red-flowered (RR) and white-flowered (WW) plants produce pink-flowered (RW) offspring in the F₁ generation. When these pink-flowered plants are self-crossed (RW x RW), the resulting F₂ generation displays a genotypic ratio of 1:2:1 (1 RR: 2 RW: 1 WW), which corresponds to the expected Mendelian inheritance pattern for incomplete dominance. The other options are not relevant as they do not provide any alternative answers or explanations related to the genetic ratios observed in this scenario.
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