Which of the following plants is an example for an exception to Mendel’s law of dominance?
Which of the following plants is an example for an exception to Mendel’s law of dominance?
The correct option is B Antirrhinum majus
Law of dominance states that: When parents with pure, contrasting traits are crossed, only the dominant trait appears in the F1 generation.
When Mendel’s experiments were repeated with different plants to check the universality of the Law of dominance, it was found that sometimes the F1 progenies show a phenotype that is different from the two parents and was intermediate between the two. The inheritance of flower colour in dog flower (snapdragon or Antirrhinum majus) is a good example.
When a cross was conducted between true-breeding red-flowered (RR) and true-breeding white-flowered (rr) Antirrhinum plants, the offspring (Rr) plant had pink-flowered. When the F1undergoes self-pollination, the F2generation has offspring in the following ratio -
1 (RR) Red: 2 (Rr) Pink: 1 (rr) White. This phenomenon is known as incomplete dominance.
Law of dominance states that: When parents with pure, contrasting traits are crossed, only the dominant trait appears in the F1 generation.
When Mendel’s experiments were repeated with different plants to check the universality of the Law of dominance, it was found that sometimes the F1 progenies show a phenotype that is different from the two parents and was intermediate between the two. The inheritance of flower colour in dog flower (snapdragon or Antirrhinum majus) is a good example.
When a cross was conducted between true-breeding red-flowered (RR) and true-breeding white-flowered (rr) Antirrhinum plants, the offspring (Rr) plant had pink-flowered. When the F1undergoes self-pollination, the F2generation has offspring in the following ratio -
1 (RR) Red: 2 (Rr) Pink: 1 (rr) White. This phenomenon is known as incomplete dominance.
