Two genes - Two genes Mendel went on two consider what...

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Two genes Mendel went on two consider what happened if he crossed plants together which differed with respect to more than one character trait (a so-called dihybrid cross). Independent assortment What Mendel discovered can be put very simply, the two characteristics behaved completely independently of each other. He called this the rule of independent assortment . Here is an example of a cross between a strain which produced smooth yellow seeds and one with wrinkled green seeds.
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The classes of offspring in the F2 occur in the well known 9:3:3:1 ratio, 9 Yellow smooth : 3 green smooth : 3 yellow wrinkled : 1 green wrinkled. This ratio is the result of the two genes behaving completely independently of each other in the cross.
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Using probability The Punnett sqare is a fine method of working out straightforward events. However, not all life is straightforward! Most of you have some background in mathematics and will have covered elementary probability. For those who have not, I strongly recommend reading Mange and Mange pp50-57.
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