Help the Rossi's understand how it is that Kai has NF1. Did he acquire it from them, or, was his case spontaneous? Explain your reasoning and, in your explanation, include the following terms or concepts:

genotype

phenotype

homozygous

heterozygous

inheritance

alleles

dominant

recessive

(For NF1, approximately half of all cases are the result of a child inheriting the disorder from one parent who has a dysfunctional neurofibromin gene. In the other half of the cases, there is no family history of the disorder. In these cases, the disorder is the result of a spontaneous mutation in the DNA of the gamete, the sperm or egg, from which a child was conceived.)

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