Explain the Law of Dominance using a monohybrid cross.

Explanation

Mendel observed that in `F_1` hybrids the character of tallness dominated or supress the dwarf character. The character which is expressed in `F_1` generation is called dominant trait and that which remained uņexpressed is called recessive trait.
Based on his observation on monohybrid crosses, Mendel proposed Law of Dominance.
Law of Dominance:
1) Characters are controlled by discrete units called factors.
2) Factors occur in pairs.
3) In a dissimilar pair of factors pertaining to a character one member of the pair dominates (dominant) the other (reces sive).
The law of dominance is used to explain the expression of only one of the parental characters in a monohybrid cross in the `F_1` and the expression of both in the `F_2` It also explains the pro portion of 3 : 1 obtained at the `F_2`
Tall `xx` Dwarf - Parent generation

The phenotypic ratio is 3 Tall:1 Dwarf.
The genotypic ratio is 1 TT, 2Tt, 1.tt: