Exception to Mendel's law

Solution (By Examveda Team)

The exception to Mendel's law is Mirabilis.
Mendel described dominance but not incomplete dominance. Had he worked with Mirabilis jalapa rather than pea he would have pondered the cross of a plant with red flowers by one with white flowers.
All progeny were pink flowered, an intermediate phenotype. An individual who is heterozygous for a gene has two different alleles, but it is not always sufficient to produce an intermediate phenotype.