Monohybrid cross Andmonohybrid ratio :- Def : A cross between two pure (homozygous) parents having a single pair of contrasting characters is used or studied is called as monohybrid cross, and ratio obtained from monohybrid cross is called as monohybrid ratio. (Phenotypic ratio = 3:1 & Genotypic ratio = 1;2;1 ) This experiment involving 3 steps - In first step (I) - Mendel selected pure tall pea plant as a female parent and pure Dwarf pea plant as a male parent. He confirmed whether they are true breeding or not by selfing them for three generations. In step second (II) - Mendel performed artificial cross between female and male parent which were Tall & Dwarf. Mendel expecting progeny obtained from parent will be intermediate height or 50 % Tall & 50% dwarf but he surprised and found all were Tall in F 1 generation (Tt). He started thinking, where the dwarfness has gone? Why and how it got eliminated ? He thinked,
