Retinoblastoma: The Hits Just Keep Coming Part IV – Time to Reconvene Question Since Julie is indeed a carrier of the mutated RB1 allele and Chris is homozygous for the wild-type allele, what is the likelihood that their next child will inherit Julie’s RB1 mutation? Part V – A Different Kind of Hit Question Chris does not have an RB1 mutation, and is therefore homozygous wild-type. Julie is heterozygous for the mutation. However, Kay has inherited a different RB1 mutation than the one her mother carries. Therefore, Kay did not receive her mother’s mutant allele. Assuming that Chris really is the father, what other explanation might there be for how she got a germline mutation?

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