When a red flowered plant was cross pollinated by white flowered one and the offspring were self pollinated to obtain a phenotypic ratio of 1:2:1, it has to be a case of -

Incomplete dominance

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Co-dominance

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Recessive epistasis

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Pleurotropic effect of genes

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Solution

The correct option is A Incomplete dominance
Incomplete dominance or blending dominance is a type of inheritance where the hybrid is not related to either of the parents but exhibit a blending of characters of the two parents.
It shows the ratio of 1:2:1 instead of the normal 3:1 phenotypic ratio.
So, the correct option is 'incomplete dominance'

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