Because some trait's phenotypes don't indicate their genotypes so in order to predict the phenotype of the offspring you have to know the genotypes of the parents
Since there are no confirmation yet and the client is still in diagnosis if whether the client has it or not, it is best that the nurse should ask the client to do and maintain his or her activities in an adequate phase. It is also advisable that the nurse should advice the client to prevent doing things that could be of risk of muscle atrophy.
