Which of the following can not be explained on the basis of Mendel’s law of dominance ?

Alleles donot show any kind of blending and express in $F_2$  generation .

Law of Dominance :The law of dominance is used to explain the expression of only one of the parental characters in a monohybrid cross in the F1 and the expression of both in the F2 . It also explains the proportion of 3:1 obtained at the F2 .

(i) Characters are controlled by discrete units called factors.

 (ii) Factors occur in pairs.

 (iii) In a dissimilar pair of factors one member of the pair dominates (dominant) the other (recessive).