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  4. The F2 generation of a cross produced identical phenotypic and genotypic ratio. It is not an expected Mendelian result, and can be attributed to

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Q. The $F_2$ generation of a cross produced identical phenotypic and genotypic ratio. It is not an expected Mendelian result, and can be attributed to

Principles of Inheritance and Variation

Solution:

Incomplete dominance is the phenomenon where dominant allele does not completely express itself. This phenomenon was first studied in flower colour of Mirabilis jalapa or four O' clock plant. The phenotypic as well as genotypic monohybrid ratio in $F _2$ generation in incomplete dominance is $1: 2: 1$ i.e., pure dominant : hybrid : pure recessive. $F_1$ generation expresses a phenotype which is intermediate between those of the parent, e.g., pink flowers are obtained when red and white flowered plants are crossed.