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NEETZoologyPrinciples of Inheritance and Variation

Select the incorrect statement for the given figure.

Options

  1. AThe inheritance of flower colour in the dog flower is an example of incomplete dominance.
  2. BWhen the F 1 was self-pollinated the F 2 resulted in the following ratio 1 (RR) Red: 2(Rr) Pink: 1(rr) White.
  3. CThe genotype ratios were exactly as in any mendelian monohybrid cross.
  4. DThe phenotype ratios were exactly as in any mendelian monohybrid cross.

Correct answer

D. The phenotype ratios were exactly as in any mendelian monohybrid cross.

Step-by-step solution

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 true-breeding white-flowered plants (rr), the F 1 (Rr) was pink (Figure 4.6). When the F 1 was self-pollinated the F 2 resulted in the following ratio 1 (RR) Red: 2(Rr) Pink: 1(rr) White. Here the genotype ratios were exactly as we would expect in any mendelian monohybrid cross, but the phenotype ratios had changed from the 3:

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