These laws can break down with linked genes, beta, because they are too close on the chromosome to assort independently. But the obvious answer in the books feels different to me when I see my own son. His condition, they say, is from a new mutation—a single error that segregated all on its own, with no family history to trace! It makes me think these laws are for predicting patterns in peas, not for understanding the solitary shock in a parent's heart.
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