What happens to alleles between the p generation and the F2 generation?

What happens to alleles between the p generation and the F2 generation?
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In the P generation, one parent is homozygous dominant and theother parent is homozygous recessive. In the F1 generation, theproduct of a cross between the P generation, the offspring are allheterozygous. In the F2 generation, the product of a cross betweenthe F1 generation, the expected result is 1/4 homozygous dominant,1/2 heterozygous, and 1/4 homozygous recessive.
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Which one of the following cannot be explained on the basis of Mendel’s law of dominance? (a) The discrete unit controlling a particular character is called a factor. (b) Out of one pair of factors one is dominant, and the other recessive. (c) Alleles do not show any blending and both the characters recover as such in F2 generation. (d) Factors occur in pairs.

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