Law of hetrozygous is not the law of inheritance proposed by Mendel. Mendel had given three laws of inheritance which included law of dominance, law of segregation of gametes, and the law of independent assortment.

Law of segregation is also known as law of purity of gametes as gametes are always remained pure by separating the genes or factors at the time of gamete formation.

Dihybrid cross is the cross which involves the analysis of two independent traits. This law shows that during gametogenesis, assortment of one pair of genes is independent to the other pair.

The semidominant allele produces its biochemical products in lesser quantity in comparison to a dominant allele. Thus the heterozygote is of intermediate intensity. Example: cross of red and white flower gives pink flower.