Which one of the following can be explained on the basis of Mendel's Law of Dominance?

A. Out of one pair of factors one is dominant and the other is recessive.

B. Alleles do not show any expression and both the characters appear as such in F₂ generation.

C. Factors occur in pairs in normal diploid plants.

D. The discrete unit controlling a particular character is called factor.

E. The expression of only one of the parental characters is found in a monohybrid cross.

Choose the correct answer from the options given below:

The Law of Dominance proposed by Gregor Mendel explains how traits are inherited and expressed in offspring. According to this law:
1. Characters are controlled by discrete units called factors (now known as genes) (Statement D).
2. These factors always occur in pairs in a normal diploid organism (Statement C).
3. In a dissimilar pair of factors, one member of the pair dominates (dominant) over the other member (recessive) (Statement A).
4. This law explains why only one of the parental characters is expressed in the F₁ generation of a monohybrid cross, while both characters are expressed in a 3:1 ratio in the F₂ generation (Statement E).

On the other hand, Statement B refers to the fact that alleles do not show any blending and both characters are recovered as such in the F₂ generation. This is explained by Mendel's Law of Segregation, not the Law of Dominance. Therefore, Statement B is excluded.

Hence, the statements that can be explained on the basis of Mendel's Law of Dominance are A, C, D, and E only.