Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
1. The discrete unit controlling a particular character is called a factor
2. Out of one pair of factors one is dominant, and the other recessive
3. Alleles do not show any blending and both the characters recover as such in F2 generation.
4. Factors occur in pairs
Alleles do not show any blending and both the characters recover as such in F2 generation