Thursday 11/21/13 Gregor Mendel and Monohybrid Crosses

Gregor Mendel- (1850's) Often called "Father of Genetics" Austrian monk, Worked with pea plants. (Plant pass down genes in the same way that animals, so this worked out.) Identified seven traits within pea plants to work with.

• Flower color, position, plant height, pod color, pod shape, pea color and seed shape

I. The Monohybrid Cross- cross between parents that have different characteristics for 1 trait.

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Parental (P)              True-breeding Tall(M)    x    True-breeding dwarf(F)  (Truebred is like purebred)

1st Filial (F1)                                             All Tall

2nd Filial (F2)                                        Tall : Dwarf
(Inbreeding of F1's)                                    3 : 1 ratio
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Key:                               P       Male plant (TT)      x       Female plant (tt)    

T = Tall plant                             Sperm ~~(T)                         Egg (t)
t = Dwarf plant
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                     F1      Male offspring (Tt)    x    Female offspring (Tt)
- - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - -
                                     F2                  Punnet Square