Jerry is six years old. His sister Hanah has the autosomal recessive condition neuronal ceroid lipofuscinosis that affects learning and coordination. Their parents are healthy. Given that Jerry has a normal phenotype and is not affected by the disorder, the probability that Jerry is a homozygote for the wild type allele of the gene that causes the condition is
A) 1/8.
B) 1/4.
C) 1/3.
D) 2/3.
C) 1/3.
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