In 4-o'clock plants, the crossing of red-and white-flowered pure parental stocks produced pink-flowered plants. This type of genotypic expression is known as

Dominance

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Co-dominance

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Incomplete dominance

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Gene polymorphism

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Solution

The correct option is C Incomplete dominance
When none of the factors of a gene is dominant, the phenotype of a heterozygous dominant individual is a blend of dominant and recessive traits. This is called as incomplete dominance. For example, flower colour in Mirabilis jalapa or the 4 o'clock plants. The red flower is the dominant character and the white flower is recessive character. There is blending of the two alleles and the flowers in the F $_{1}$ generation will be pink in colour due to mixing of the alleles.
Thus, the correct answer is option C.

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