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A mating between individuals heterozygous for the same alleles at a single locus that produces two heterozygous offspring (A). In this situation, the fraction of alleles shared between the siblings is not known with certainty: the siblings either share 0 alleles with 0.5 probability (B) or 2 alleles with 0.5 probability (C). However, the conventional (and correct) estimate of the fraction of alleles shared by this sibling pair would be 
