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Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
A
Factors occur in pairs
B
The discrete unit controlling a particular character is called a factor
C
Out of one pair of factors one is dominant, and the other recessive
D
Alleles do not show any blending and both the characters recover as such in $F_2$ generation
Detailed Solution
The Law of Dominance states: (i) characters are controlled by discrete units called factors; (ii) factors occur in pairs; (iii) in a dissimilar pair of factors one member dominates (dominant) the other (recessive).
So the first three statements are all parts of the Law of Dominance.
The fact that alleles do not blend, and that both the parental characters are recovered as such in the $F_2$ generation, is explained by the Law of Segregation: the two factors of a pair separate during gamete formation so that each gamete receives only one.
Hence the statement about non-blending of alleles and recovery of both characters in $F_2$ cannot be explained by the Law of Dominance.
So the first three statements are all parts of the Law of Dominance.
The fact that alleles do not blend, and that both the parental characters are recovered as such in the $F_2$ generation, is explained by the Law of Segregation: the two factors of a pair separate during gamete formation so that each gamete receives only one.
Hence the statement about non-blending of alleles and recovery of both characters in $F_2$ cannot be explained by the Law of Dominance.