t.s. of Pinus needle


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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...
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