" Consider the following pedigree of a rare, autosomal recessive trait called phenylketonuria (PKU). Shaded individuals have the disease which involves the inability of a person to break down the amino acid phenylalanine. Left untreated, it results in profound mental developmental delays. In the USA, the disease is observed in the population at a rate of 1 in 14,000. Apply the inbreeding convention where required. If individual B chooses to marry someone from the general population, what is the probability that the couple has an affected child