Usually random mutations occur in the heterozygous state, it is a lot less likely that both allele would mutate in the homozygous state.

The first "Kahl" Albino was part of a group, I think five. So in that case I think it is more likely that each of the parents had a random mutation on one allele, and they happened to breed together to produce the Albinos. In cases where only one of the mutation is born from wild type parents, I think that the mutation was entirely random.

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