Mirabilis Jalapa:

In Mirabilis Jalapa, there are two distinctive kinds of flower colors namely the white and red. Both types are true breeding. Whenever a pure-red flowered (r_1r1) variety is crossed with a pure white flowered (r₂r₂) one, the F₁ hybrids generate pink flower, a character that is intermediate among white and red colored flowers of the parental generation. This is since neither red flower color or white is totally dominant over the other. Whenever F₁ hybrids were selfed red, pink and white flowered varieties were acquired correspondingly in the ratio of 1:2:1.

This is the phenotypic ratio. In this, the genotypic ratio is also 1:2:1, generating one homozygous red, two heterozygous pink and one homozygous white. The red and white varieties breed true on self fertilization of the F₂ individuals however the pink varieties on selfing once again generate a phenotypic ratio of 1:2:1 confirming the law of purity of gametes.

As neither of the parents is totally dominant over the other, the symbol for Red parent is r₁r₁ and the white parent r₂r₂, and therefore naturally the genotype of the hybrid is r₁r₂.

It has been noticed in the given illustration that there is blending of phenotypes-not genotypes and the alleles of the genes are particulate or discrete. They emerge blended in F₁ however have estranged out in F₂ generation.

Incomplete dominance is also termed as blending inheritance since both the characters of the parental plants are mixed to provide an intermediate character that is dissimilar from that of the parents. However only the characters are mixed with one other and not the alleles. In Mirabilis the r₁r₁ always generates red colored flowers and r₂r₂ generates white colored flowers, whenever they joint, and the intermediate color namely pink is generated. Because of this it is explained as blending inheritance.

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