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When you cross these double hets, keep the amel locus and the anery locus together. That is, 90% of the time, the offspring will inherit either "aE" or "Ae." The two traits together will almost inherit like a single trait. The results are shown in figure 1.
The other 10% of the time, the a-locus and e-locus will "cross over." When this happens, an offspring can inherit either "AE" or "ae." In order to be a "snow" (the expression of both traits: anery and amel) an offspring must be "aaee." For this to happen, it must inherit "ae" from one parent, and "ae" from the other parent. To illustrate all possible outcomes, the above grid is multiplied by ten. One of the ten copies represents the 10% chance of crossover in each parent. The crossovers create the "AE" and "ae" pairs for each parent.
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