Mirabilis Jalapa is also called as snapdragon or Antirrhinum. It is the cross between true breeding red and white flower plants resulting in the formation of four pink flowers (Rr) in F1 progeny . If the F1 progeny was self pollinated the F2 progeny has red,pink,white flowers in the ratio. { RR : Rr : rr } - 1:2:1. From this result we can conclude that R was not completely dominating r resulting in blending of characters.(as pink).

Incomplete Dominance in Mirabilis jalapa:
Mirabilis jalapa, also known as the Four O'Clock Flower, exhibits incomplete dominance in its flower color inheritance. In incomplete dominance, neither allele is completely dominant over the other, resulting in an intermediate phenotype in heterozygous individuals.

Explanation:
- In Mirabilis jalapa, the alleles for flower color are not fully dominant or recessive.
- When a red-flowered plant (RR) is crossed with a white-flowered plant (WW), the offspring (RW) display a pink flower color, which is a blend of the red and white alleles.
- This pink coloration is the result of incomplete dominance, where both alleles contribute to the final phenotype.

Example:
- If we denote the red allele as R and the white allele as W, the genotype for a pink-flowered plant would be RW.
- This intermediate phenotype is a characteristic feature of incomplete dominance seen in Mirabilis jalapa.

Significance:
- Incomplete dominance allows for a greater diversity of phenotypes within a population.
- It highlights the intricate nature of genetic inheritance and the complexities of gene expression.
- Understanding incomplete dominance in Mirabilis jalapa can provide insights into the genetics of other plant species as well.