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Question

The phenotypic ratio obtained in the F2 generation of a monohybrid cross in dog flower plant is ___.


A

1:2:1

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B

3:1

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C

1:1

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D

2:1

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Solution

The correct option is A

1:2:1


Dog flower plant (Antirrhinum majus) or snapdragon shows incomplete dominance. In the cross of red and white flowering snapdragon- all the F1 offspring had pink flowers, indicating that neither red nor white flower color was dominant. Heterozygotes are thus intermediate in color. Further when two of the F1 pink flowers were crossed, they produced red, pink, and white-flowered plants in a 1:2:1 ratio in the F2 generation.


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