Geometric Characteristics-Geometric characteristics refer to the basic elements or building blocks which form the language of geometric dimensioning and tolerancing. Generally, the term refers to all the symbols used in form, runout, profile and locational tolerancing. Geometrical Characteristics-Geometrical characteristics refer to the basic elements or building blocks, which form the language of geometric dimensioning and tolerancing. Generally, the term refers to all the symbols used in form, runout, and locational tolerancing. Definition Per.
Parent 1 and 2 have each 5 possible genotypes (OO, AO, BB, BO and AB). Here a Punnett square with each possibilities. I highlighted the possible parent genotypes. The total number of possible crosses is exactly 21. Note that here A = Ia, B = Ib and O = i. 1  OOxBB,OOxBO,OOxAB. 2  AOxBB,AOxBO,AOxAB.
With one gene controlling a trait we have three possible genotypes, AA, Aa and aa and depending on the allelic interactions (dominance or incomplete dominance) we can have two or three phenotypes. As more and more genes control a trait, a greater number of genotypes are possible. The formula that predicts the number of genotypes from the number of genes is 3 to the power n. (n is the number of genes.) The following is the number of genotypes for a selected number (n) of genes which control an arbitrary trait.