Medical Genetics Genetic region screening 3.3kb deleted in H mutant allele for a H (NOTE: not Exon 2 Probe the H 4.2 kb many Probe different mutations Parents in the pKu gene have Children been kb identified) PKU alleleMedical Genetics Genetic screening for "a" (NOTE: not "the" - many different mutations in the PKU gene have been identified) PKU allele