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Principles of Inheritance and Variation question

2012 · Q37
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Principles of Inheritance and Variation question

2012 · Q37

NEETBiologyPrinciples of Inheritance and VariationMCQ+4 / −1
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of
  1. A
    Monohybrid cross with incomplete dominance
  2. B
    Co - dominance
  3. C
    Monohybrid cross with complete dominance
  4. D
    Dihybrid cross
View written solutionFree

Correct answer: A

The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum sp.) is a good example which shows incomplete dominance. In a cross between true-breeding red-flowered (RR) and true-breeding white-flowered plants (rr), the F1 (Rr) was pink. When the F1 was self-pollinated the F2 resulted in the following ratio, 1 (RR) Red : 2 (Rr) Pink : 1 (rr) White. Here the genotype ratios were 1 : 2 : 1 as in any Mendelian monohybrid cross, but the phenotype ratios had changed from the 3 : 1 dominant : recessive ratio to 1 : 2 : 1.

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